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Keiji

#11,361 in 2025Boys' name

経時: age, through けいじ

Keiji has been given to 173 babies in the U.S. since 1923. In 2025 it ranked #11,361 of 13,926 boys’ names in use. Its peak year was 2009, with 15 recorded.

Babies named Keiji, 2025

1 in 553,000

Keiji over time, 1880–2025

Boys
05101518801900192019401960198020002020

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Keiji: meaning, origin, and history

経時: age, through けいじ

Japanese

What Keiji means

Keiji belongs to the name family reached through Keiji → けいじ. Its meaning is “経時: age”.

Origin, language, and formation

Keiji is used in English. Its origins include Japanese.

Keiji comes through Japanese けいじ.

Related names and everyday forms

Related names include けいじ.

American usage and historical context

In the United States, 173 boys were recorded with the name Keiji between 1923 and 2025. Its highest annual count was 15 in 2009; its best national rank was #3,314 in 1923.

Over 5 years its rank fell, from #10,093 in 2020 to #11,361 in 2025. Over 10 years its rank fell, from #9,169 in 2015 to #11,361 in 2025.

Sources & methodologyReferences, data & attribution

Meaning, origin, and language notes draw on the references below.

American popularity figures use published Social Security Administration records for this exact spelling. Counts below five for a name, sex, and year are omitted.

Wiktionary material is available under CC BY-SA 4.0.

How common is Keiji?

Everything below is computed from the 2025 data — the most recent year available.

Among all babies, 2025
1 in 553,000
6 of 3,315,165 births
Among boys only
1 in 285,000
<0.01% of boys
Rank, 2025
#11,361
of 13,926 boys’ names in use
Coin-flip room size
382,984 kids
Even odds of a second one

Where Keiji 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 2025 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 382,984 children born in 2025 and it's an even bet that one of them is another Keiji. In a class of 30 the chance is Under 1%.

When Keijis were born

Half of everyone ever recorded as Keiji was born before 2010 — so the typical Keiji is around 15 today.

Median birth year
2010
About 15 years old
Biggest decade
2010s
35.8% of all use
Born in the last 25 years
82.7%
A modern name
Recorded since 1950
143
People you could plausibly meet
Choose a decade

2010s — 35.8% of all recorded uses (62).

Is Keiji 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
−1,268
Places dropped
Rank vs 10 years ago
−2,192
Places dropped
Births vs 10 years ago
0.75×
Fewer babies than then
Share of its own peak
40.0%
Peak was 2009 (15)
Years since peak
16
Years
Year-to-year steadiness
Volatile
46.9% average annual change
Best rank ever
#3,314
1923

Spellings of Keiji

Keiji is not the most common spelling — Keith is, with 95.5% against Keiji's 0.04%.

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Where Keiji is used

Across 1910–2025, Keiji was most concentrated in Hawaii — about 1 in 100,000 boys, against 1 in 782,566 across all states with data. It was least common in California (1 in —).

01 per 100,000

Most concentrated

  1. 1Hawaii1 in 100,000
  2. 2California1 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. Keiji has too little recent state data to map, so this covers all years from 1910.

Keiji around the world

Where Keiji ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

  • France
    2010–2025
    #6,023
    in 2025

Popularity data from Institut national de la statistique et des études économiques. INSEE data under Licence Ouverte / Etalab 2.0.

Keiji by the numbers

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

As a boy's name

Rank in 2025
#11,361
Trend vs 5 yrs ago
Down 1,268
Best rank ever
#3,314
1923
Peak year
2009
15 that year
First recorded
1923
Last recorded
2025
All-time count
173
Count in 2025
6

Names similar to Keiji

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

KeinanKeisonKeilerKeitaKeizerKeidenKeinerKeimariKeivonKeigoKeinoKeianKeiyonKeimonKeilonKeilynSeijiKeilenKeiganKeitonKeikoKeiranKeirKein

Sibling names for Keiji

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 Keiji

Top names of 2009, Keiji's peak yearThe 2000s in fullOther names that peaked in 1923Boys' names starting with K