Thaddeus vs Thadius
American parents have registered 26,089 Thaddeuses since 1880, against 511 Thadiuses. Thaddeus is still ahead, with 314 babies in 2025.
Babies given each name, 1880–2025
Thaddeus Thadius
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
Thaddeus has been the commoner name in every year either was published, 1880 to 2025. The lead has never changed hands.
The closest they came was 1974, when Thaddeus had 236 and Thadius had 19.
Side by side
| Thaddeus | Thadius | |
|---|---|---|
| Total US births | 26,089 | 511 |
| Most in one year | 416 | 19 |
| Babies in 2025 | 314 | under 5 |
| Estimated living today | 18,000 | 470 |
| Median age today | 35 | 33 |
| Peak year | 2016 | 1974 |
| Best rank | 638th boys | 2,199th boys |
| Rank in 2025 | 797th | unranked |
| First recorded | 1880 | 1922 |
| Girls / boys | 32 / 26,057 | 0 / 511 |
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 Thaddeuses alive today are over 35; half the Thadiuses are over 33. That is 2 years between them: two names in use at the same time, worn by two different generations.
Compare something else
Related comparisons
Social Security Administration birth records, 1880–2025, public domain. Full histories: Thaddeus and Thadius.