Illiam

Boy name

Illiam has been given to 42 babies in the U.S. since 1975. It peaked in 1981.

Popularity over time births per year, 1880–2025

Hover or tap the chart to read any year.

Total babies

Peak year

1981 (8 babies)

Rank in 2025

Below top 1000

First recorded

1975

10-year trend

New / returning

Gender split

All boys

Names one letter away from Illiam — alternate spellings parents actually use.

4,215,725 babies since 1880

Same primary gender, peaked around the same years, and roughly as common as Illiam.

42 babies since 1968

42 babies since 1969

42 babies since 1977

42 babies since 1977

42 babies since 1983

43 babies since 1965

43 babies since 1969

43 babies since 1971

How popular is the name Illiam?

Illiam has been given to 42 babies in the U.S. since 1975. It ranked below the top 1000 in 2025.

When did the name Illiam peak?

Illiam peaked in 1981, when 8 babies were given the name.

Is Illiam a girl or boy name?

Illiam is primarily a boy name (100% of babies named Illiam are boys).

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