Tatsuo

Boys' name

Achieve

Tatsuo has been given to 222 babies in the U.S. since 1915. 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 1916, with 57 recorded.

Babies named Tatsuo, 1940

1 in 384,000

Tatsuo over time, 1880–2025

Boys

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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Tatsuo: meaning, origin, and history

Achieve

Deeper origin not confirmed in the cited records

What Tatsuo means

Tatsuo means “achieve”.

Documented naming usage and pronunciation

Tatsuo is used in Japanese.

Another recorded pronunciation is /tä.t͡sɨᵝ.o̞/ for Tatsuo.

American usage and historical context

In the United States, 222 boys were recorded with the name Tatsuo between 1915 and 1940. Its highest annual count was 57 in 1916; its best national rank was #833 in 1916.

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.

U.S. Social Security Administration: national name data and limitations

How common is Tatsuo?

Tatsuo had fewer than 5 recorded uses in 2025, so these figures use 1940, the last year it was published.

Among all babies, 1940: 1 in 384,000; 6 of 2,302,666 births
Among boys only: 1 in 193,000; <0.01% of boys
Rank, 1940: Unranked; Fewer than 5 uses
Coin-flip room size: 266,016 kids; Even odds of a second one

Where Tatsuo 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 1940 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 266,016 children born in 1940 and it's an even bet that one of them is another Tatsuo. In a class of 30 the chance is Under 1%.

When Tatsuos were born

Half of everyone ever recorded as Tatsuo was born before 1921 — so the typical Tatsuo is around 104 today.

Median birth year: 1921; About 104 years old
Biggest decade: 1920s; 50.5% of all use
Born in the last 25 years: 97.3%; A modern name
Recorded since 1950: 0; People you could plausibly meet

Choose a decade

1920s — 50.5% of all recorded uses (112).

Is Tatsuo 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 1916 (57)
Years since peak: 109; Years
Year-to-year steadiness: Volatile; 117.1% average annual change
Best rank ever: #833; 1916

Spellings of Tatsuo

Tatsuo is not the most common spelling — Tatum is, with 94.7% against Tatsuo's 1.6%.

Tatum94.7%13,225
Mitsuo3.7%521
Tatsuo1.6%222

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 Tatsuo is used

Across 1910–2025, Tatsuo was most concentrated in Hawaii — about 1 in 5,000 boys, against 1 in 122,442 across all states with data. It was least common in California (1 in —).

020 per 100,000

State popularity map

Most concentrated

1Hawaii1 in 5,000
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. Tatsuo has too little recent state data to map, so this covers all years from 1910.

Tatsuo 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: #833; 1916
Peak year: 1916; 57 that year
First recorded: 1915
Last recorded: 1940
All-time count: 222
Count in 2025: Under 5

Names similar to Tatsuo

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

Tatem Tateum Taten Tetsuo Tatsuya Tatsuki Yasuo Mitsuo Tatsumi Tatiana Tathan Jitsuo Taton Matsuo Tatum Tateyn Tatton Tatumn Masuo Tatym Itsuo Tatsuro Tatsu Mutsuo

Sibling names for Tatsuo

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

Era Leatha Leone Artie Alpha Hettie Cecil Ona

For a brother

Winfield Dorsey Isadore Aloysius Hyman Regis Sydney Meyer

Explore around Tatsuo

Top names of 1916, Tatsuo's peak year The 1910s in full Other names that peaked in 1916 Boys' names starting with T