Total births
42
Boys' name · since 1975
Illiam
Since 1975, U.S. Social Security records show 42 babies named Illiam, peaking in 1981. See the year-by-year trend, decade totals, and state rankings below, sourced from federal birth data.
- 42
- total births
- 1975–1989
- years on record
- 1980s
- peak decade
- 88%
- born in that decade
Illiam sits outside today's top ranks for boys, with 42 recorded since 1975.
Social Security Administration records show Illiam recorded 42 times among boys since 1975, though it doesn't currently rank among the most-used boys names, peaking in the 1980s. This profile derives year-by-year birth trends, decade totals, and state-level distribution directly from SSA birth-registration files spanning 1975 to 1989.
- 42 total births
- 1975–1989 years on record
- 1980s peak decade
- 88% born in that decade
Data updated Jun 2026
The verdict
42 boys have been named Illiam since 1975, peaking in the 1980s, last recorded in 1989.
- 42
- total births
- 1975–1989
- years on record
- 1980s
- peak decade
- 88%
- born in that decade
1980s
Peak decade
88% of everyone ever named Illiam was born in this single decade.
1981
Single peak year
8 babies were named Illiam in 1981 - its busiest year on record.
Illiam's usage pattern, beyond the headline number
Splitting Illiam's full recorded timeline at 1985, 57% of its total births fall in the more recent half of the record versus 43% in the earlier half -- a fairly even split across the full record. Its quietest year on record was 1975, with just 5 recorded births -- worth weighing against the 1981 peak of 8 to see the full range of the name's swing in popularity.
Illiam at a glance
Last recorded 1989Peak year
1981
Current rank
Unranked
Active since
1975
Illiam popularity over time
Annual U.S. births registered with the Social Security Administration · 1975–1989
- Peak year (1981)
- 8
- Annual births at peak, across 15 years of records
Illiam by decade
Total births in each ten-year window, peak vs trough at a glance
1980s was Illiam's strongest decade.
37 babies received the name during that ten-year window, about 88% of all-time use.
Illiam births by decade
Total births in each ten-year window
- 1970s 5
1970s
5 births
- 1980s
1980s
37 births
What this shows Peak: 1980s at 37 births (88% of all-time use).
Frequently Asked Questions
How popular is the name Illiam? ▼
Since 1975, Social Security records show 42 babies named Illiam. The most recent recorded year was 1989. Its busiest year on record was 1981, with 8 births.
When was Illiam most popular? ▼
Illiam was most popular in the 1980s decade with 37 total births. The single peak year was 1981.
How long has the name Illiam been used? ▼
Illiam has been recorded in Social Security data since 1975, spanning 15 years of data through 1989.
What names are similar to Illiam? ▼
Names with a similar sound or spelling include Illya, Illias, Illian, Illidan, and 3 more. These share a common prefix and are also used for boys.
Keep exploring Illiam
Nearby Names Like Illiam
Names with a similar sound, spelling, or feel to Illiam
Illya Boy
#12622 365 births
Illias Boy
126 births
Illian Boy
#8949 25 births
Illidan Boy
#11798 22 births
Illijah Boy
11 births
Compare Illiam side by side: Illiam vs Illya Illiam vs Illias Illiam vs Illian
Related Names
Names with a similar number of total births
Data Sources
Data as of June 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, 1975–1989 (ssa.gov/oact/babynames).
State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).
Cite this page
NameAlmanac Editorial. "Illiam: Baby Name Since 1975 - 42 Births, Peak 1981." NameAlmanac. Accessed via https://namealmanac.com/name/illiam. 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 Illiam 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 June 2026.