William vs. Liam: which name is older?
The average William is 51 and the average Liam is 11, so William is the older name, by about 40 years.
William
Liam
When was each name popular?
William peaked first, in 1947 (after World War II). Liam peaked in 2024, 77 years later.
Which name is more common?
There are about 2.1 million Williams and about 360,000 Liams alive in the US, so there are about 6 times as many Williams as Liams.
Boys or girls?
Both are boys' names: over 99% of living Williams and over 99% of living Liams are men.
Names the same age as William
Names the same age as Liam
More comparisons: Liam vs. Noah
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William or Liam: questions
Which is older, William or Liam?
The average William is 51 and the average Liam is 11, so William is the older name, by about 40 years.
How old is the average William?
The average William in the US is 51; half of all living Williams are between 32 and 70.
How old is the average Liam?
The average Liam in the US is 11; half of all living Liams are between 5 and 14.
Which is more common, William or Liam?
There are about 2.1 million Williams and about 360,000 Liams alive in the US, so there are about 6 times as many Williams as Liams.
Estimates from Social Security Administration baby-name records (births 1880–2025) and SSA cohort life tables (2026 Trustees Report). How we calculate this