Seiko

UnisexBoys' nameGirls' name

Literal meaning not recorded; Japanese origin

Seiko has been given to 35 babies in the U.S. since 1921. 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 1924, with 7 recorded. It's used for both sexes: 69% boys, 31% girls all-time.

Babies named Seiko, 1925

1 in 467,000

Seiko over time, 1880–2025

BoysGirls

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Girls or boys — Seiko over time

In 2009, Seiko went to 100% girls and 0% boys.

19192009

A sex is only published in years it reached five applications, so a stretch at 0% or 100% means the other side stayed under that floor — not that it was never used.

Seiko: meaning, origin, and history

Literal meaning not recorded; Japanese origin

Japanese

What Seiko means

Seiko is a given name.

Origin, language, and formation

Seiko is used in English. Its origins include Japanese.

American usage and historical context

In the United States, 24 boys were recorded with the name Seiko between 1921 and 1925. Its highest annual count was 7 in 1924; its best national rank was #3,807 in 1924.

In the United States, 11 girls were recorded with the name Seiko between 1919 and 2009. Its highest annual count was 6 in 2009; its best national rank was #5,450 in 1919.

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 Seiko?

Seiko had fewer than 5 recorded uses in 2025, so these figures use 1925, the last year it was published.

Among all babies, 1925: 1 in 467,000; 5 of 2,333,232 births
Among boys only: 1 in 223,000; <0.01% of boys
Rank, 1925: Unranked; Fewer than 5 uses
Coin-flip room size: 323,456 kids; Even odds of a second one

Where Seiko 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 1925 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 323,456 children born in 1925 and it's an even bet that one of them is another Seiko. In a class of 30 the chance is Under 1%.

When Seikos were born

Half of everyone ever recorded as Seiko was born before 1923 — so the typical Seiko is around 102 today.

Median birth year: 1923; About 102 years old
Biggest decade: 1920s; 100.0% of all use
Born in the last 25 years: 100.0%; A modern name
Recorded since 1950: 0; People you could plausibly meet

Choose a decade

1920s — 100.0% of all recorded uses (24).

Is Seiko 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 1924 (7)
Years since peak: 101; Years
Year-to-year steadiness: Shifting; 22.6% average annual change
Best rank ever: #3,807; 1924

Spellings of Seiko

Seiko is not the most common spelling — Niko is, with 64.0% against Seiko's 0.10%.

Niko64.0%14,629
Shilo5.6%1,270
Sekou4.9%1,118
Spiro4.4%1,011
Neko4.4%1,001
Miko4.3%980
Eino3.6%814
Neiko3.5%797

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 Seiko is used

Across 1910–2025, Seiko was most concentrated in Hawaii — about 1 in 25,000 boys, against 1 in 24,622 across all states with data.

44 per 100,000

State popularity map

Most concentrated

1Hawaii1 in 25,000

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. Seiko has too little recent state data to map, so this covers all years from 1910.

Seiko 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: #3,807; 1924
Peak year: 1924; 7 that year
First recorded: 1921
Last recorded: 1925
All-time count: 24
Count in 2025: Under 5

As a girl's name

Rank in 2025: Unranked
Trend vs 5 yrs ago: —
Best rank ever: #5,450; 1919
Peak year: 2009; 6 that year
First recorded: 1919
Last recorded: 2009
All-time count: 11
Count in 2025: Under 5

Names similar to Seiko

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

Seiya Jeiko Keiko Maiko Yeiko Aniko Heiko Seiki Reiko Seitu Seigo Amiko Seith Kniko Seiji Iniko Ziko Seif Seiichi Demiko Liko Sein Aiko Biko

Sibling names for Seiko

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

For a sister

Rosina Kattie Lavon Blanch Jaunita Vernell Dorris Leonora

For a brother

Alvis Eldridge Merritt Lacy Delmer Wilton Elwin Domenick

Explore around Seiko

Top names of 1924, Seiko's peak year The 1920s in full Other names that peaked in 1924 Boys' names starting with S