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Evidence-led referenceJapanese names, readings and kanji
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ReferenceNamesKōichirō
Canonical reference record
JMnedict-backedKANJIDIC2 character context
Japanese given name

Kōichirō

亘一朗

Given-name classification varies across source records.

こういちろうコウイチロウKōichirō
Compare spellings
Reference coverage

Extended source depth

This reading group has a comparatively broad dictionary footprint across source-recorded spellings or records. The counts describe corpus coverage, not real-world popularity.

Distinct recorded spellings164

group-level written forms

Source spelling/reading rows164

records contributing to this reading group

Coverage levelExtended

based only on the imported source footprint

Pronunciation & romanization

How to read Kōichirō

The kana reading is source-recorded. Romanization and mora segmentation are deterministic reading aids generated from that kana; pitch accent is not inferred.

Source readingこういちろう

Normalized to hiragana for comparison.

Katakana formコウイチロウ

The same reading converted to katakana.

RomanizationKōichirō

Macron-style display. Vowel-sequence form: Kouichirou. Personal spelling and true vowel boundaries can differ.

Mora segmentationこ · う · い · ち · ろ · う

6 morae in this reading. Small ゃ/ゅ/ょ-type kana join the preceding mora.

Audio note: the play button uses Japanese text-to-speech provided by the visitor’s browser/device. It is a convenience preview, not a recorded native-speaker pronunciation or pitch-accent authority.

Reading profile

How Kōichirō is represented

These counts describe records in the imported name corpus. They are not a ranking of how popular a spelling is among people in Japan.

Recorded kana readings1

こういちろう

Kanji-based spellings164

among the forms analyzed on this page

Kana characters6

in the primary dictionary reading

Morae6

small ゃ/ゅ/ょ-type kana combine with the preceding mora

3-kanji forms164

recorded spellings

JMnedict classification evidence

How this reading is classified in the source corpus

This separates dictionary classification from popularity. The same exact kana reading can be recorded as a given name, a surname, or both, and given-name records can carry male, female or unspecified source labels.

Primary reading recorded asGiven name

こういちろう in the imported JMnedict corpus

Given-name written forms167

168 source spelling/reading rows

Surname written forms0

0 source spelling/reading rows

Given-name labelsmale 165 · unspecified 3

row counts carrying each JMnedict source label

Exact readingGiven-name evidenceGiven-name labelsSurname evidence
こういちろうKōichirō167168 source rowsmale 165 · unspecified 3source rows · distinct forms: male 164 · unspecified 300 source rows

Classification boundary: male/female/unspecified are labels attached to imported JMnedict name records. They are not population shares, probabilities, identity claims, or evidence that a spelling is currently common in Japan. A source row can also be repeated across different written forms, so row counts and distinct-writing counts are shown separately.

Spelling anatomy

Corpus structure behind Kōichirō

This section summarizes the exact source-recorded forms loaded for this reading group. Stroke and character-position statistics are descriptive corpus properties, not popularity or style scores.

Kanji forms with complete stroke data164

14–31 strokes observed span

Median total strokes23

among forms with complete KANJIDIC2 stroke data

All-kanji name-classified forms153

all component kanji loaded as jōyō/jinmeiyō classes

Other/unclassified kanji forms11

contains at least one character outside that loaded classification

Source-reading distribution
ReadingRomanizationMoraeForms
こういちろうKōichirō6164
Recurring adjacent kanji sequences
一郎51 analyzed forms一朗25 analyzed forms市郎22 analyzed forms壱朗21 analyzed forms壱郎21 analyzed forms市朗21 analyzed forms

Shown only when the same adjacent two-kanji sequence occurs in at least two analyzed source forms. Open a sequence in Kanji Pair Research for corpus co-occurrence context.

Reading ambiguity

Can the same writing be read another way?

9 of 80 displayed written forms have more than one given-name reading somewhere in the active JMnedict corpus. This is dictionary-record ambiguity, not a prediction of how a particular person reads the name.

Written forms checked80

distinct spellings displayed on this page

Multiple recorded readings9

exact written forms with 2+ source readings

Single recorded reading71

within this active given-name corpus

Largest reading set3

distinct kana readings for one displayed writing

A reading shown without a link is still source-recorded, but its destination group does not currently meet the canonical publication standard. Strong reference pages do not promote limited records merely to create extra internal links.

Kanji role reference

How recurring characters function across Kōichirō spellings

Position counts are calculated only from the distinct written forms analyzed for this page. KANJIDIC2 nanori are character-level name-reading references; they are not used here to decompose or assert the reading of a specific multi-kanji name.

KanjiCharacter glossesFormsFirstFinalInternalSoloStrokesKANJIDIC2 nanoriLoaded class
郎son, counter for sons94094009いら, お, とう, もん +2Jōyō · KANJIDIC grade 8
一one, one radical (no.1)79007901かず, い, いっ, いる +7Jōyō · KANJIDIC grade 1
朗clear, bright, distinct670670011—Jinmeiyō · KANJIDIC grade 10
市market, city, town43004305い, ちJōyō · KANJIDIC grade 2
壱one (in documents)42004207い, かずJōyō · KANJIDIC grade 8
宏wide, large770007あつ, ひろ, ひろしJinmeiyō · KANJIDIC grade 9
恒constancy, always770009のぶ, ひさ, ひさしJōyō · KANJIDIC grade 8
紘large7700010ひろ, ひろしJinmeiyō · KANJIDIC grade 9
亘span, range, extend over660006のぶ, とうる, わたる, ひさしJinmeiyō · KANJIDIC grade 9
光ray, light660006あき, あきら, こお, てる +3Jōyō · KANJIDIC grade 2
功achievement, merits, success660005いさ, かつ, くぬ, ぐう +5Jōyō · KANJIDIC grade 4
厚thick, heavy, rich660009あ, あっJōyō · KANJIDIC grade 5

Counts describe this source-recorded spelling set, not population use. A repeated kanji can contribute to more than one position role across different spellings.

Exact writing research map

Move from a spelling to its readings, characters and literal sequence context

These relationships are exact and source-backed. Whole-name readings shown in each card come from JMnedict within the current name class; exact-writing search can surface records from other name classes. Character links open KANJIDIC2-backed kanji pages. Sequence context means the same kanji string occurs contiguously in another recorded written form—it does not prove shared origin or meaning.

Showing research maps for the first 10 distinct written forms out of 164. Every detailed spelling card below still links to exact-writing search and its component kanji.

For VPS safety, contiguous-sequence lookups are limited to six 2–4 kanji forms per canonical page and cached for 12 hours per active JMnedict generation.

Corpus pattern

Kanji recurring across Kōichirō spellings

Only characters appearing in at least two distinct analyzed spellings are shown here. Frequency describes this source-recorded spelling set, not real-world baby-name popularity.

郎son, counter for sons94 of 164 analyzed forms一one, one radical (no.1)79 of 164 analyzed forms朗clear, bright, distinct67 of 164 analyzed forms市market, city, town43 of 164 analyzed forms壱one (in documents)42 of 164 analyzed forms宏wide, large7 of 164 analyzed forms恒constancy, always7 of 164 analyzed forms紘large7 of 164 analyzed forms亘span, range, extend over6 of 164 analyzed forms光ray, light6 of 164 analyzed forms
Same reading, different writing

Explore written forms of Kōichirō

164 source-recorded forms use the primary source reading こういちろう. Other source readings can appear in this romanized group when the imported records converge on the same index form. Use Compare to inspect exact spellings side by side.

Showing the first 80 spelling/reading records out of 164 loaded records for this reading group. The group contains 164 distinct written spellings.

Spelling comparator

Compare Kōichirō forms side by side

Each exact written spelling appears once in this table even when JMnedict records more than one reading for that writing. Stroke totals and character glosses come from KANJIDIC2 when all component kanji are available.

SpellingOne source readingCharacter-level glossesTotal strokesLoaded character class
亘一朗こういちろう亘 — span, range · 一 — one, one radical (no.1) · 朗 — clear, bright18All kanji jōyō/jinmeiyō-classified
亘一郎こういちろう亘 — span, range · 一 — one, one radical (no.1) · 郎 — son, counter for sons16All kanji jōyō/jinmeiyō-classified
亘壱朗こういちろう亘 — span, range · 壱 — one (in documents) · 朗 — clear, bright24All kanji jōyō/jinmeiyō-classified
亘壱郎こういちろう亘 — span, range · 壱 — one (in documents) · 郎 — son, counter for sons22All kanji jōyō/jinmeiyō-classified
亘市朗こういちろう亘 — span, range · 市 — market, city · 朗 — clear, bright22All kanji jōyō/jinmeiyō-classified
亘市郎こういちろう亘 — span, range · 市 — market, city · 郎 — son, counter for sons20All kanji jōyō/jinmeiyō-classified
亨一郎こういちろう亨 — pass through, go smoothly · 一 — one, one radical (no.1) · 郎 — son, counter for sons17All kanji jōyō/jinmeiyō-classified
倖一郎こういちろう倖 — happiness, luck · 一 — one, one radical (no.1) · 郎 — son, counter for sons20All kanji jōyō/jinmeiyō-classified
光一朗こういちろう光 — ray, light · 一 — one, one radical (no.1) · 朗 — clear, bright18All kanji jōyō/jinmeiyō-classified
光一郎こういちろう光 — ray, light · 一 — one, one radical (no.1) · 郎 — son, counter for sons16All kanji jōyō/jinmeiyō-classified
光壱朗こういちろう光 — ray, light · 壱 — one (in documents) · 朗 — clear, bright24All kanji jōyō/jinmeiyō-classified
光壱郎こういちろう光 — ray, light · 壱 — one (in documents) · 郎 — son, counter for sons22All kanji jōyō/jinmeiyō-classified
光市朗こういちろう光 — ray, light · 市 — market, city · 朗 — clear, bright22All kanji jōyō/jinmeiyō-classified
光市郎こういちろう光 — ray, light · 市 — market, city · 郎 — son, counter for sons20All kanji jōyō/jinmeiyō-classified
公一朗こういちろう公 — public, prince · 一 — one, one radical (no.1) · 朗 — clear, bright16All kanji jōyō/jinmeiyō-classified
公一郎こういちろう公 — public, prince · 一 — one, one radical (no.1) · 郎 — son, counter for sons14All kanji jōyō/jinmeiyō-classified

The comparison table shows the first 16 distinct written forms; the detailed cards above show up to 80 spelling/reading records.

What does Kōichirō mean?

There is not necessarily one fixed English meaning. The reading identifies the spoken name; different written forms can use different kanji. Character glosses describe individual kanji and should not be treated as proof of the intention behind a particular person’s name.

Related readings

More names beginning with こう

Related by the opening kana of the dictionary reading. This is a deterministic browsing relationship, not a claim that the names share the same meaning.

Given name · male · limited reference

Kōji

268 recorded spellings

Explore →Given name · male · limited reference

Kōnosuke

148 recorded spellings

Explore →Given name · male · limited reference

Kōjirō

145 recorded spellings

Explore →Given name · mixed records · limited reference

Kōki

138 recorded spellings

Explore →Given name · male · limited reference

Kōsaburō

128 recorded spellings

Explore →Given name · male · limited reference

Kōtarō

117 recorded spellings

Explore →Given name · male · limited reference

Kōsuke

104 recorded spellings

Explore →Given name · male · limited reference

Kōichi

101 recorded spellings

Explore →Given name · male · limited reference

Kōzō

97 recorded spellings

Explore →Given name · mixed records · limited reference

Kōsei

78 recorded spellings

Explore →Given name · mixed records · limited reference

Kō

77 recorded spellings

Explore →Given name · male · limited reference

Kōshō

64 recorded spellings

Explore →
Continue research

Where to go next from Kōichirō

Use literal reading, character and corpus relationships to continue without treating nearby records as automatically related.

Exact reading

Search こういちろう

See source records matching this kana reading or beginning with it.

Continue →Reading family

Ko / こ

Browse other public given names with the same opening reading family.

Continue →Character reference

郎 — son, counter for sons

Open the kanji page for readings, classifications and literal name-use context.

Continue →Character reference

一 — one, one radical (no.1)

Open the kanji page for readings, classifications and literal name-use context.

Continue →Interactive discovery

Open Name Explorer

Use the same name type and 6-mora reading length as a starting point.

Continue →
Evidence on this page

What each source establishes

JMnedict establishes recorded written forms, readings and name classifications; where safely associated, this page can also show JMnedict-supplied trans_det source text without treating it as a whole-name meaning. KANJIDIC2 supplies character readings, nanori, stroke counts, grade classes and English character glosses. The Ministry of Justice remains the official reference for Japanese child-name character rules. The Agency for Cultural Affairs romanization guidance is the reference for generated Latin-script reading aids.

JMnedictChecked 17 Sep 2026Active data built 16 Sep 2026Stored status: downloaded
KANJIDIC2Checked 17 Sep 2026Active data built 17 Sep 2026
Japan Ministry of Justice — characters usable in children’s namesChecked 17 Sep 2026
Japan Agency for Cultural Affairs — Romanization Rules (2025)Checked 17 Sep 2026
Source boundary

The spelling-frequency and structural counts on this page are calculated from imported JMnedict records. They are corpus counts, not population-frequency claims. KANJIDIC2 supplies the kanji metadata used in character and stroke comparisons.

Review sources →