Historical-origin boundary
No single historical origin is assigned here. JMnedict attests 山口 with the reading やまぐち as a surname, but the sources used for this page do not establish one place or lineage shared by every Yamaguchi family.
reviewed#14 in 2018 survey sample
山口
Yamaguchi Japanese Surname
やまぐち
Yamaguchi is a dictionary-attested Japanese family name, written 山口 and read やまぐち. It ranked #14 in Meiji Yasuda Life’s 2018 nationwide policyholder survey.
Surname facts
The ranking figures come from the cited policyholder survey and should not be read as census totals.
- Hiragana
- やまぐち
- Pronunciation
- yah-mah-goo-chee
- Usage status
- Common
- Mora count
- 4
- 2018 sample rank
- #14 nationwide
- Survey sample share
- 0.51% (record count not published in this table)
- Survey estimate
- Not published for this rank in the survey table
- Record status
- Reviewed
- Last reviewed
- July 25, 2026
Kanji meaning
These are character-level dictionary glosses, kept separate from claims about family history.
- 山 — mountain
- 口 — mouth
What the spelling can—and cannot—tell us
The character-level and orthographic glosses shown here are “mountain” and “mouth”. They are not a verified whole-surname translation or proof of one family origin.
Origin and regional evidence
Observed regional pattern
In the 2018 survey, Yamaguchi ranked tenth across western Japan (0.55%) and fourth in the Kyushu–Okinawa regional sample (0.79%). It ranked first in Nagasaki (2.06%) and second in Saga (1.98%).
Romanization, pronunciation, and usage notes
Romanization and variants
No separate reviewed variant is published for this record.
Pronunciation notes
- The reading has 4 mora: や・ま・ぐ・ち.
- The page uses the Hepburn-style ASCII spelling Yamaguchi.
Evidence-aware context
- JMnedict contains the exact spelling-and-reading pair 山口・やまぐち and classifies it as a surname.
- The national rank is a result from a large insurance-policyholder sample, not a count of every resident of Japan.
Frequently asked questions
Is Yamaguchi a Japanese surname?
Yes. JMnedict classifies 山口 with the reading やまぐち as a Japanese surname.
How common is Yamaguchi?
It ranked #14 nationwide in Meiji Yasuda Life’s 2018 policyholder sample, with a published sample share of 0.51%. The report’s table for ranks 11–100 did not publish a per-surname record count or population estimate; the underlying dataset was not a census.
Do the kanji reveal every Yamaguchi family's exact origin?
No. Character glosses explain written elements, but do not establish one lineage, birthplace, or occupation for every bearer.
Common misunderstandings
- The literal kanji glosses do not establish a single fixed surname meaning or a documented origin for a particular family.
- A shared surname does not by itself prove that all bearers belong to one ancestral line.
Similar common surnames
Continue with related reviewed surnames from the same nationwide top-20 survey set.
Sources and evidence limits
Each source supports named fields only. Dictionary status, character glosses, survey frequency, and family history are separate questions.
- ENAMDICT/JMnedict Japanese Proper Names Dictionary
Electronic Dictionary Research and Development Group · JA,EN · accessed Jul 25, 2026
Fields supported on this page
Kanji, Hiragana, Romaji, Is Real Surname
JMnedict classifies 山口 [やまぐち] as a surname.
Source limitation
Dictionary inclusion does not measure current frequency, guarantee a reading for every bearer, or establish legal acceptance of a new registration.
- KANJIDIC Project
Electronic Dictionary Research and Development Group · JA,EN · accessed Jul 25, 2026
Fields supported on this page
Literal Meanings
KANJIDIC supplies character-level English glosses only.
Source limitation
Character glosses are not whole-name translations and do not establish an intended whole-name meaning or family etymology.
- 2018 Meiji Yasuda Life Nationwide Surname Survey
Meiji Yasuda Life Insurance Company · JA · accessed Jul 25, 2026
Fields supported on this page
Usage Status, Ranking, Regional Association
Rank and share come from report table 2, which does not publish a per-surname count or population estimate; regional observations come from tables 3, 4, 6, 7, 9, or 10 as stated.
Source limitation
The survey covers approximately 6.558 million Meiji Yasuda individual life-insurance and annuity policyholders as of May 2018; it is a large company sample, not a census of all residents of Japan. Estimated populations extrapolate sample shares to the national population.