Spellings
Lucas or Lukas?
In the US in 2025, 90% of babies in this name family were spelled Lucas and 10% Lukas. Same name, slightly different impression: here are the figures for each spelling.
Ten years ago
Lucas already led in 2015, with 90% of the family's births; it has 90% in 2025. All spellings together, the family went from 13,761 to 11,380 births (−17%).
| Spelling | 2015 | 2025 | Change |
|---|---|---|---|
| Lucas | 12,331 | 10,219 | −17% |
| Lukas | 1,430 | 1,161 | −19% |
How they sound
All of these spellings are said the same way: /ˈlukəs/ (LOO-kus). So the choice is about how it looks: it is the spelling people will read on a birth card, a name tag or an email address, and the one your child will sometimes spell out.
In France
In France in 2025: Lucas 1,875 births (#19 among boys) and Lukas 50 births (#764 among boys).
Sources: Social Security Administration (SSA), Insee (France), 2025 data. How we calculate these figures.
Which spelling is yours?
The one-minute style quiz.