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Japanese surname

川口

Kawaguchi

かわぐち · カワグチ

Generate with this surname
Popularity
common
Origin type
topographic, geographic
Literal meaning
Mouth of the river
Data status
partially verified

Kanji breakdown

See how the written form is built

Origin landscape

A visual reading of the surname

A river meeting a wider body of water
Reusable origin illustration: A river meeting a wider body of water. This is a conceptual aid, not evidence of a specific ancestral location.

Origin confidence

Literal interpretation only

The character meaning is clear, but a surname-specific historical origin has not been established here.

Kawaguchi is a transparent topographic spelling often interpreted as a settlement or location near a river mouth.

This interpretation does not mean that everyone with this surname shares one ancestor or one place of origin.

Regional evidence

Distribution across Japan

Reliable regional distribution data is not yet available for this surname.

We do not infer modern population distribution from the kanji, a general origin story, or an unverified historical claim.

Green · modern population distributionRed · possible historical originLiteral inference is never mapped

Historical context

Japanese surname timeline

No surname-specific dated event has completed source review. The timeline below provides historical context for Japanese surname systems.

  1. Ancient Japan

    Ancient clan names

    Early name systems could signal clan affiliation, rank, or political relationship. They were not the same as every modern household sharing a surname.

  2. Medieval period

    Family and place names

    Warrior families and local lineages increasingly used names associated with estates, settlements, and geographic features.

  3. Edo period

    Edo-period naming customs

    Public use of surnames varied by status and context; naming practice was more complex than a simple ban for all commoners.

  4. 1875

    Universal surname registration

    A Meiji government proclamation required people to use a surname, helping establish the modern nationwide system.

  5. Modern Japan

    Modern distribution

    A surname’s present distribution can reflect migration as well as multiple, independent points of origin.

Natural pairings

First names to pair with Kawaguchi

川口 光Kawaguchi HikariUse →川口 湊Kawaguchi MinatoUse →川口 楓Kawaguchi KaedeUse →

Evidence trail

Sources

These references support general name-system history, kanji readings, or the research method. They do not all establish one family lineage.

  1. Index of readings in the Jōyō Kanji Table

    Agency for Cultural Affairs, Japan · Accessed 2026-07-29

  2. Research guide: Japanese surnames and family names

    National Diet Library · Published 2022-12-21 · Accessed 2026-07-29