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Koichi

Boys' name

From Japanese こういち; literal meaning unconfirmed

Koichi has been given to 145 babies in the U.S. since 1914. It was used fewer than 5 times in 2025, so it doesn't appear in the latest year's list — today it's a genuinely uncommon pick. Its peak year was 1921, with 16 recorded.

Babies named Koichi, 2007

1 in 800,000

Koichi over time, 1880–2025

Boys
0510152018801900192019401960198020002020

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Koichi: meaning, origin, and history

From Japanese こういち; literal meaning unconfirmed

Japanese

What Koichi means

Koichi is a given name.

Dictionary etymologyReferences, data & attribution

Borrowed from Japanese こういち (Kōichi), a male given name with many variant kanji spellings.

Excerpt from Wiktionary: Koichi (English) · CC BY-SA 4.0

Wiktionary material is available under CC BY-SA 4.0.

Origin, language, and formation

Koichi is used in English. Its origins include Japanese.

Koichi comes through Japanese こういち.

American usage and historical context

In the United States, 145 boys were recorded with the name Koichi between 1914 and 2007. Its highest annual count was 16 in 1921; its best national rank was #2,109 in 1921.

How common is Koichi?

Koichi had fewer than 5 recorded uses in 2025, so these figures use 2007, the last year it was published.

Among all babies, 2007
1 in 800,000
5 of 3,997,748 births
Among boys only
1 in 415,000
<0.01% of boys
Rank, 2007
Unranked
Fewer than 5 uses
Coin-flip room size
554,207 kids
Even odds of a second one

Where Koichi sits on the popularity scale

Rarest published (5 a year)#1 — Liam (20,818)

Chance at least one other child shares the name

If the other children were drawn at random from the 2007 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%
Class of 30Under 1%
Grade of 100Under 1%
School of 500Under 1%

Put another way: gather 554,207 children born in 2007 and it's an even bet that one of them is another Koichi. In a class of 30 the chance is Under 1%.

When Koichis were born

Half of everyone ever recorded as Koichi was born before 1922 — so the typical Koichi is around 103 today.

Median birth year
1922
About 103 years old
Biggest decade
1920s
55.9% of all use
Born in the last 25 years
11.0%
Spread across generations
Recorded since 1950
16
People you could plausibly meet
Choose a decade

1920s — 55.9% of all recorded uses (81).

Is Koichi rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago
—
Not ranked then
Rank vs 5 years ago
New entry
Not ranked then
Rank vs 10 years ago
—
Not ranked then
Births vs 10 years ago
—
Not published both years
Share of its own peak
0%
Peak was 1921 (16)
Years since peak
104
Years
Year-to-year steadiness
Volatile
35.6% average annual change
Best rank ever
#2,109
1921

Where Koichi is used

Across 1910–2025, Koichi was most concentrated in Hawaii — about 1 in 8,333 boys, against 1 in 48,285 across all states with data. It was least common in Washington (1 in —).

012 per 100,000

Most concentrated

  1. 1Hawaii1 in 8,333
  2. 2Washington1 in —

Shading is the share of that state's recorded boys given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Koichi has too little recent state data to map, so this covers all years from 1910.

Koichi by the numbers

The raw record for each sex the name is used for.

As a boy's name

Rank in 2025
Unranked
Trend vs 5 yrs ago
—
Best rank ever
#2,109
1921
Peak year
1921
16 that year
First recorded
1914
Last recorded
2007
All-time count
145
Count in 2025
Under 5

Names similar to Koichi

Matched on shared beginnings and endings, similar length, and comparable popularity.

ItachiSeichiTaichiMachiDaichiMalichiTobechiMunachiShoichiKelechiDavinchiAkachiIkechiMelachiKenichiKoiMasaichiMalechiOsinachiJunichiShinichiSeiichiYoichiKiichi

Sibling names for Koichi

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

Explore around Koichi

Top names of 1921, Koichi's peak yearThe 1920s in fullOther names that peaked in 1921Boys' names starting with K