Gillian vs Gillis
American parents have registered 16,127 Gillians since 1880, against 712 Gillises. Gillian is still ahead, with 47 babies in 2025.
Babies given each name, 1880–2025
Gillian Gillis
Each line is every baby given the name that year, girls and boys added together — the only count that means the same thing for both names. A line breaks where the name fell below five babies in a year — the point at which the SSA stops publishing it — rather than being drawn through a figure nobody published. A single published year in a gap shows as a dot.
Who was ahead
Of the 116 years in which either name was published, Gillian for 79 years and Gillis for 37 years. The lead changed hands 3 times.
Side by side
| Gillian | Gillis | |
|---|---|---|
| Total US births | 16,127 | 712 |
| Most in one year | 1,030 | 20 |
| Babies in 2025 | 47 | under 5 |
| Estimated living today | 16,000 | 240 |
| Median age today | 26 | 70 |
| Peak year | 1999 | 1923 |
| Best rank | 303rd girls | 1,753rd boys |
| Rank in 2025 | 3,296th | unranked |
| First recorded | 1922 | 1900 |
| Girls / boys | 16,059 / 68 | 0 / 712 |
A rank is a position within one sex’s list for one year, so the two rank rows are not subtracted from one another and the winning column is not marked on them. The living figure is a life-table estimate, not a count.
Which name is older
Half of the Gillises alive today are over 70; half the Gillians are over 26. That is 44 years between them: two names in use at the same time, worn by two different generations.
Both names abroad
Countries whose statistics office publishes both names, so the comparison can be made somewhere other than the United States.
| Country | Gillian | Gillis |
|---|---|---|
| Belgium | 328 | 6 |
Every spelling a country files separately is added together, over whatever years that country publishes — which is not the same range in any two of them, so read the columns against each other and not the rows.
Compare something else
Related comparisons
Social Security Administration birth records, 1880–2025, public domain. Full histories: Gillian and Gillis.