Total births
21
Girls' name · since 1918
Ailleen
Since 1918, U.S. Social Security records show 21 babies named Ailleen, peaking in 1925. See the year-by-year trend, decade totals, and state rankings below, sourced from federal birth data.
- 21
- total births
- 1918–1925
- years on record
- 1920s
- peak decade
- 76%
- born in that decade
21 girls have been named Ailleen since 1918, though it isn't currently a top-ranked name.
Social Security Administration records show Ailleen recorded 21 times among girls since 1918, though it doesn't currently rank among the most-used girls names, peaking in the 1920s. This profile derives year-by-year birth trends, decade totals, and state-level distribution directly from SSA birth-registration files spanning 1918 to 1925.
- 21 total births
- 1918–1925 years on record
- 1920s peak decade
- 76% born in that decade
Data updated Jul 2026
The verdict
21 girls have been named Ailleen since 1918, peaking in the 1920s, last recorded in 1925.
- 21
- total births
- 1918–1925
- years on record
- 1920s
- peak decade
- 76%
- born in that decade
1920s
Peak decade
76% of everyone ever named Ailleen was born in this single decade.
1925
Single peak year
6 babies were named Ailleen in 1925 - its busiest year on record.
Ailleen's usage pattern, beyond the headline number
Divide Ailleen's SSA record in two at 1924 and the more recent half accounts for 52% of all births, the earlier half the remaining 48%, a genuinely balanced usage pattern. Its calmest year was 1918, with only 5 births recorded -- set against the 1925 peak of 6, that's the full swing in one name's fortunes.
Ailleen at a glance
Last recorded 1925Peak year
1925
Current rank
Unranked
Active since
1918
Ailleen popularity over time
Annual U.S. births registered with the Social Security Administration · 1918–1925
- Peak year (1925)
- 6
- Annual births at peak, across 8 years of records
Ailleen by decade
Total births in each ten-year window, peak vs trough at a glance
1920s was Ailleen's strongest decade.
16 babies received the name during that ten-year window, about 76% of all-time use.
Ailleen births by decade
Total births in each ten-year window
- 1910s 5
1910s
5 births
- 1920s
1920s
16 births
What this shows Peak: 1920s at 16 births (76% of all-time use).
Frequently Asked Questions
How popular is the name Ailleen? ▼
Ailleen has been given to 21 babies in the U.S. since 1918, according to SSA data. Its last appearance in the data was 1925. 6 babies were born in 1925, its single highest year.
When was Ailleen most popular? ▼
Ailleen was most popular in the 1920s decade with 16 total births. The single peak year was 1925.
How long has the name Ailleen been used? ▼
The SSA has tracked Ailleen since 1918 -- 8 years through the most recent 1925 data.
What names are similar to Ailleen? ▼
Names with a similar sound or spelling include Aileen, Ailany, Ailani, Ailyn, and 4 more. These share a common prefix and are also used for girls.
Keep exploring Ailleen
Nearby Names Like Ailleen
Names with a similar sound, spelling, or feel to Ailleen
Aileen Girl
#720 37,637 births
Ailany Girl
#101 11,160 births
Ailani Girl
#327 7,899 births
Ailyn Girl
#1387 4,490 births
Aila Girl
#793 4,268 births
Compare Ailleen side by side: Ailleen vs Aileen Ailleen vs Ailany Ailleen vs Ailani
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, 1918–1925 (ssa.gov/oact/babynames).
State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).
Cite this page
NameAlmanac Editorial. "Ailleen: Baby Name Since 1918 - 21 Births, Peak 1925." NameAlmanac. Accessed via https://namealmanac.com/name/ailleen. 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 Ailleen 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.