Spellings
Isaac or Issac?
In the US in 2025, 94% of babies in this name family were spelled Isaac and 4% Issac. Same name, slightly different impression: here are the figures for each spelling.
Isaac94% of the family5,953 born in 2025#47 among boys−40% since 2015Issac4% of the family258 born in 2025#915 among boys−49% since 2015Isaak1% of the family48 born in 2025#2,676 among boys−61% since 2015Isak1% of the family38 born in 2025#3,128 among boys+12% since 2015Isac<1% of the family22 born in 2025#4,539 among boys−48% since 2015Isaaq<1% of the family0 born in 2025
Ten years ago
Isaac already led in 2015, with 93% of the family's births; it has 94% in 2025. All spellings together, the family went from 10,695 to 6,319 births (−41%).
| Spelling | 2015 | 2025 | Change |
|---|---|---|---|
| Isaac | 9,988 | 5,953 | −40% |
| Issac | 509 | 258 | −49% |
| Isaak | 122 | 48 | −61% |
| Isak | 34 | 38 | +12% |
| Isac | 42 | 22 | −48% |
How they sound
- Isaac /ˈaɪzək/ (EYE-zik)
- Issac /ˈaɪzək/ (EYE-zik)
- Isaak /ˈaɪzək/ (EYE-zuhk)
- Isak /iˈzak/ (ee-ZAK)
- Isac /iˈzak/ (ee-ZAK)
- Isaaq /iˈsak/ (ee-SAK)
In France
In France in 2025: Isaac 2,660 births (#11 among boys), Issac 20 births, Isaak 60 births (#668 among boys), Isak 40 births (#920 among boys), Isac 60 births (#668 among boys) and Isaaq 35 births (#998 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.