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.

#23,353 of 45,481
all-time among boys
42
born since 1975
1980s
peak 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.

  • #23,353 of 45,481 all-time among boys
  • 42 born since 1975
  • 1980s peak decade

Data updated Aug 2026

The verdict

According to the U.S. Social Security Administration, Illiam ranks #23,353 of 45,481 boys' names by all-time recorded births (highest first). 42 born since 1975, peaking in the 1980s.

#23,353 of 45,481
all-time among boys
42
born since 1975
1980s
peak decade
Below the archive median
All-time archive position

Illiam's 42 recorded births place it above 48.41% of the 45,481 boys names in the full SSA archive.

National only
State-record footprint

No state rows cleared SSA’s public reporting threshold for this name.

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 popularity over time

Annual U.S. births registered with the Social Security Administration · 1975–1989

Last recorded 1989
Peak year (1981)
8
Annual births at peak, across 15 years of records
456789 1975198119831985198619871989 6

Illiam by decade

1980s is the heaviest window (37 births, 88% of the file).

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

births

What this shows Peak: 1980s at 37 births (88% of all-time use).

Source U.S. Social Security Administration · Baby Names As of August 2026

Frequently Asked Questions

How popular is the name Illiam? ▼
Since 1975, Social Security records show 42 babies named Illiam. Across the full SSA archive it ranks #23,353 of 45,481 boys' names by total births. The most recent recorded year was 1989. Its busiest year on record was 1981, with 8 births.
Where does Illiam sit in the SSA name archive? ▼
According to the U.S. Social Security Administration, Illiam ranks #23,353 of 45,481 boys' names by all-time recorded births (highest first). All-time ordinal matches browse popularity (total births DESC); the current ordinal uses the null SSA file. See /methodology#corpus-placement.
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
365 births
Illias Boy
126 births
Illian Boy
#7663 25 births
Illidan Boy
22 births
Illijah Boy
11 births

Compare Illiam side by side: Illiam vs Illya Illiam vs Illias Illiam vs Illian

Or pick any two names to compare →

Related Names

Names with a similar number of total births

Pinckney
42 births · Peak 1922
Elda
42 births · Peak 1912
Lacie
42 births · Peak 1921
Otie
42 births · Peak 1921
Raeburn
42 births · Peak 1930
Bartolomeo
42 births · Peak 1914
Alley
42 births · Peak 1914
Rudyard
42 births · Peak 1914

Nationwide names with similar peak year or record span

Two nationwide peer axes for Illiam: closest SSA peak year, and closest first→latest record span. Distinct from the spelling and current-rank neighborhoods above.

Peak year is the single SSA year with the most births for that name; record span is first-to-latest year in the national files, not a recommendation or shared origin claim.

Data Sources

Data as of August 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).

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 August 2026.