Total births
178
Boys' name · since 1914
Iwao
Iwao has 178 recorded births since 1914 in federal Social Security data, most heavily in 1921 -- full year-by-year trend, decade aggregates, and state rankings follow.
- 178
- total births
- 1914–1936
- years on record
- 1920s
- peak decade
- 61%
- born in that decade
Iwao is not among the current top-ranked boys names; 178 have been recorded since 1914.
According to the U.S. Social Security Administration, Iwao has been recorded 178 times among boys since 1914, though it is not among the currently most-used boys names, with its heaviest use in the 1920s. This profile covers year-by-year birth trends, decade totals, and state-level distribution, all derived directly from SSA birth-registration files spanning 1914 to 1936.
- 178 total births
- 1914–1936 years on record
- 1920s peak decade
- 61% born in that decade
Data updated Jul 2026
The verdict
178 boys have been named Iwao since 1914, peaking in the 1920s, last recorded in 1936.
- 178
- total births
- 1914–1936
- years on record
- 1920s
- peak decade
- 61%
- born in that decade
1920s
Peak decade
61% of everyone ever named Iwao was born in this single decade.
1921
Single peak year
20 babies were named Iwao in 1921 - its busiest year on record.
Iwao's usage pattern, beyond the headline number
Divide Iwao's SSA record in two at 1923 and the more recent half accounts for 44% of all births, the earlier half the remaining 56%, a genuinely balanced usage pattern. Its calmest year was 1914, with only 5 births recorded -- set against the 1921 peak of 20, that's the full swing in one name's fortunes.
Iwao at a glance
Last recorded 1936Peak year
1921
Current rank
Unranked
Active since
1914
Iwao popularity over time
Annual U.S. births registered with the Social Security Administration · 1914–1936
- Peak year (1921)
- 20
- Annual births at peak, across 23 years of records
Iwao by decade
Total births in each ten-year window, peak vs trough at a glance
1920s was Iwao's strongest decade.
109 babies received the name during that ten-year window, about 61% of all-time use.
Iwao births by decade
Total births in each ten-year window
- 1910s
1910s
54 births
- 1920s
1920s
109 births
- 1930s 15
1930s
15 births
What this shows Peak: 1920s at 109 births (61% of all-time use).
Iwao by state
Where Iwao concentrates geographically, total births since 1914
| Rank | State | Visual share | Births | Share of total |
|---|---|---|---|---|
| #1 | Hawaii | | 66 | 37.1% |
| #2 | California | | 26 | 14.6% |
Hawaii share of Iwao's total US births 37.1%
Even split
66 of 178 births nationwide. Compared to a flat distribution across 2 reporting states.
Frequently Asked Questions
How popular is the name Iwao? ▼
Since 1914, Social Security records show 178 babies named Iwao. The most recent recorded year was 1936. Its busiest year on record was 1921, with 20 births.
When was Iwao most popular? ▼
Iwao was most popular in the 1920s decade with 109 total births. The single peak year was 1921.
Where is Iwao most popular? ▼
The top states for the name Iwao are Hawaii (66 births), California (26 births).
How long has the name Iwao been used? ▼
Records for Iwao go back to 1914, giving 23 years of history through 1936.
What names are similar to Iwao? ▼
Names with a similar sound or spelling include Iwan. These share a common prefix and are also used for boys.
What to do with Iwao's data
- Iwao's decade-level peak was the 1920s (109 total births); usage has since declined to 15 in the 1930s -- if you're weighing a "classic revival" angle, the trend line argues against it.
- Hawaii records the most Iwaos (66 births) -- see the full state breakdown if geography matters to your decision. Hawaii names
- Weighing it against an alternative? Put two names side by side. Compare names
Figures reflect SSA-reported births only; see the methodology above for the privacy-suppression floor.
Keep exploring Iwao
Nearby Names Like Iwao
Names with a similar sound, spelling, or feel to Iwao
Compare Iwao side by side: Iwao vs Iwan
Related Names
Names with a similar number of total births
Data Sources
Data as of July 2026. Source: U.S. Social Security Administration (SSA).
According to the Social Security Administration, this profile draws directly from the agency's public-use baby-name files (updated June 2026). See our methodology for the full extraction, aggregation, and privacy-suppression rules.
Primary: Source: U.S. Social Security Administration, Baby Names from Social Security Card Applications, National Data, 1914–1936 (ssa.gov/oact/babynames).
State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).
Cite this page
NameAlmanac Editorial. "Iwao: Baby Name Since 1914 - 178 Births, Peak 1921." NameAlmanac. Accessed via https://namealmanac.com/name/iwao. Licensed CC BY-SA 4.0.
Name Almanac is rendered directly from the Social Security Administration's public baby-name files, no number is typed in by an editor. This profile for Iwao draws directly on SSA national and state-level files, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of July 2026.