Brother names for Isaac
EYE-zik · 2 syllables
Common across France, the UK, three Canadian provinces, and 8 more places.
Ranked by fit
40 brother names for Isaac, ranked by fit. Add your surname to re-rank.
1 in 202, Northern Ireland
Say it LEE-vy
Rose and fell with Isaac · Same generation as Isaac
Loved across the Netherlands, three German cities, three Australian states, and 1 more place. Common across three Canadian provinces, Israel, Sweden, and 10 more places. Rare in France, England and Wales, Italy, and 4 more places.
1 in 202 boys born in Northern Ireland in 2025. Number 52 there.
1 in 289, Ireland
Say it AIR-un
Rose and fell with Isaac · Same generation as Isaac
Common in France, Ontario, Austria, and 12 more places. Rare in England and Wales, Italy, Poland, and 9 more places.
1 in 289 boys born in Ireland in 2025. Number 71 there.
1 in 164, England and Wales
Say it ih-LY-juh
Rose and fell with Isaac · Same generation as Isaac
Loved across three Australian states and New Zealand. Common across the UK, Ontario, Ireland, and 2 more places. Rare in France, Italy, Poland, and 15 more places.
1 in 164 boys born in England and Wales in 2025. Number 23 there.
1 in 153, Northern Ireland
Say it EE-thun
Rose and fell with Isaac · Same generation as Isaac
Loved in British Columbia. Common across France, the UK, Italy, and 9 more places. Rare in Poland, Israel, the Netherlands, and 11 more places.
1 in 153 boys born in Northern Ireland in 2025. Number 32 there.
1 in 255, Scotland
Say it NAY-thun
Rose and fell with Isaac · As common as Isaac
Common in France, England and Wales, Italy, and 8 more places. Rare in Poland, Israel, Sweden, and 11 more places.
1 in 255 boys born in Scotland in 2025. Number 56 there.
1 in 319, Northern Ireland
Say it EE-ly
Rose and fell with Isaac · Same generation as Isaac
Common across Quebec, Northern Ireland, three Australian states, and New Zealand. Rare in France, England and Wales, Italy, and 19 more places.
1 in 319 boys born in Northern Ireland in 2025. Number 90 there.
1 in 162, Northern Ireland
Say it KAY-lub
Rose and fell with Isaac · As common as Isaac
Common across the UK, three Canadian provinces, New Zealand, and South Australia. Rare in France, Italy, Poland, and 15 more places.
1 in 162 boys born in Northern Ireland in 2025. Number 36 there.
1 in 136, Northern Ireland
Say it JAY-kub
Rose and fell with Isaac · As common as Isaac
Common across the UK, three Canadian provinces, Ireland, and 5 more places. Rare in France, Italy, Poland, and 13 more places.
1 in 136 boys born in Northern Ireland in 2025. Number 27 there.
1 in 354, England and Wales
Say it SAM-yoo-ul
Rose and fell with Isaac · As common as Isaac
Common across France, the UK, Italy, and 25 more places. Rare in Poland, Israel, Slovenia, and 1 more place.
1 in 354 boys born in England and Wales in 2025. Number 66 there.
1 in 290, England and Wales
Say it JOSH-oo-uh
Rose and fell with Isaac · As common as Isaac
Common across the UK, Ontario, Ireland, and 6 more places. Rare in France, Italy, Poland, and 13 more places.
1 in 290 boys born in England and Wales in 2025. Number 53 there.
1 in 196, Scotland
Say it MAY-sun
Rose and fell with Isaac · Same generation as Isaac
Common across the UK, the Netherlands, Ontario, and 7 more places. Rare in France, Italy, Poland, and 14 more places.
1 in 196 boys born in Scotland in 2025. Number 41 there.
1 in 177, Scotland
Say it LOH-gun
Rose and fell with Isaac · As common as Isaac
Common across the UK, three Canadian provinces, Victoria, and South Australia. Rare in France, Italy, Poland, and 15 more places.
1 in 177 boys born in Scotland in 2025. Number 35 there.
1 in 387, England and Wales
Say it ZAK-uh-ree
Rose and fell with Isaac · Hebrew, like Isaac
Common in England and Wales, Quebec, and British Columbia. Rare in France, Italy, Poland, and 18 more places.
1 in 387 boys born in England and Wales in 2025. Number 75 there.
1 in 97, England and Wales
Say it OS-ker
Rose and fell with Isaac · Same generation as Isaac
Loved in England and Wales and Denmark. Common in France, the Netherlands, Sweden, and 14 more places. Rare in Italy, Poland, Israel, and 8 more places.
1 in 97 boys born in England and Wales in 2025. Number 8 there.
1 in 252, England and Wales
Say it sih-BAS-chun
Rose and fell with Isaac · As common as Isaac
Loved in Estonia. Common in England and Wales, Italy, Poland, and 10 more places. Rare in France, Israel, the Netherlands, and 13 more places.
1 in 252 boys born in England and Wales in 2025. Number 47 there.
1 in 103, England and Wales
Say it THEE-uh-dor
Rose and fell with Isaac · Same generation as Isaac
Loved across England and Wales, three Canadian provinces, Australia, and New Zealand. Common in Quebec, Ireland, Scotland, and Northern Ireland. Rare in France, Italy, Poland, and 14 more places.
1 in 103 boys born in England and Wales in 2025. Number 9 there.
1 in 67, Northern Ireland
Say it CHAR-lee
Rose and fell with Isaac · Same generation as Isaac
Loved across Northern Ireland, three Australian states, and New Zealand. Common across France, England and Wales, three Canadian provinces, and 8 more places. Rare in Italy, Poland, Israel, and 8 more places.
1 in 67 boys born in Northern Ireland in 2025. Number 4 there.
1 in 731, England and Wales
Say it JAK-sun
Rose and fell with Isaac
Common across three Canadian provinces, three Australian states, and New Zealand. Rare across France, the UK, Italy, and 16 more places.
1 in 731 boys born in England and Wales in 2025. Number 138 there.
1 in 67, England and Wales
Say it NO-uh
Rose and fell with Isaac · Same generation as Isaac
Loved across France, the UK, Canada, and 19 more places. Common in Italy, Catalonia, and Spain. Rare in Poland, Israel, and Slovenia.
1 in 67 boys born in England and Wales in 2025. Number 2 there.
1 in 670, England and Wales
Say it JAY-den
Rose and fell with Isaac
Common across three Canadian provinces and Victoria. Rare across France, the UK, Italy, and 16 more places.
1 in 670 boys born in England and Wales in 2025. Number 124 there.
1 in 224, Northern Ireland
Say it MATH-yoo
Rose and fell with Isaac · Hebrew, like Isaac
Common in Ontario, Ireland, Scotland, and 2 more places. Rare in France, England and Wales, Italy, and 16 more places.
1 in 224 boys born in Northern Ireland in 2025. Number 61 there.
1 in 418, Scotland
Say it OH-in
Rose and fell with Isaac
Loved in British Columbia. Common in France, the Netherlands, Ontario, and 2 more places. Rare across the UK, Italy, Poland, and 14 more places.
1 in 418 boys born in Scotland in 2025. Number 107 there.
1 in 818, Scotland
Say it JOR-dun
Rose and fell with Isaac · Hebrew, like Isaac
Common across Ontario and three Australian states. Rare across France, the UK, Italy, and 18 more places.
1 in 818 boys born in Scotland in 2025. Number 174 there.
1 in 913, England and Wales
Say it AY-den
Rose and fell with Isaac
Common in the Netherlands, Ontario, British Columbia, and 3 more places. Rare across France, the UK, Italy, and 15 more places.
1 in 913 boys born in England and Wales in 2025. Number 170 there.
1 in 128, Ireland
Say it LOOK
Rose and fell with Isaac · As common as Isaac
Common in Ontario, Ireland, Scotland, and 4 more places. Rare in France, England and Wales, Italy, and 15 more places.
1 in 128 boys born in Ireland in 2025. Number 23 there.
1 in 76, Ireland
Say it LEE-um
Rose and fell with Isaac · Same generation as Isaac
Loved across three Canadian provinces, the Netherlands, Sweden, and 7 more places. Common across France, the UK, Italy, and 17 more places.
1 in 76 boys born in Ireland in 2025. Number 7 there.
1 in 197, England and Wales
Say it LOO-kus
Rose and fell with Isaac
Loved in the Netherlands, Ontario, British Columbia, and 2 more places. Common across France, the UK, three Nordic countries, and 11 more places. Rare in Italy, Poland, Israel, and 6 more places.
1 in 197 boys born in England and Wales in 2025. Number 32 there.
1 in 379, England and Wales
Say it DIL-un
Rose and fell with Isaac
Common in England and Wales, Italy, Quebec, and 3 more places. Rare in France, Poland, Israel, and 16 more places.
1 in 379 boys born in England and Wales in 2025. Number 72 there.
1 in 444, England and Wales
Say it AW-stin
Rose and fell with Isaac
Common in England and Wales, Ontario, Scotland, and 6 more places. Rare in France, Italy, Poland, and 17 more places.
1 in 444 boys born in England and Wales in 2025. Number 86 there.
1 in 267, Northern Ireland
Say it RY-lee
Rose and fell with Isaac
Common across the UK, Australia, and New Zealand. Rare in France, Italy, Poland, and 18 more places.
1 in 267 boys born in Northern Ireland in 2025. Number 77 there.
1 in 614, Scotland
Say it MAR-kus
Rose and fell with Isaac
Common in Victoria. Rare across France, the UK, Italy, and 19 more places.
1 in 614 boys born in Scotland in 2025. Number 140 there.
1 in 83, England and Wales
Say it LEE-oh
Rose and fell with Isaac
Loved across France, the UK, Canada, and 16 more places. Common in Italy, Poland, Israel, and 7 more places.
1 in 83 boys born in England and Wales in 2025. Number 3 there.
1 in 118, England and Wales
Say it HEN-ree
Rose and fell with Isaac
Loved across three Canadian provinces, Cologne, and Australia. Common across the UK, Sweden, Austria, and 10 more places. Rare in France, Italy, Poland, and 4 more places.
1 in 118 boys born in England and Wales in 2025. Number 13 there.
1 in 112, Northern Ireland
Say it TOM-us
Rose and fell with Isaac
Loved in Quebec and 1 more place. Common across the UK, Italy, the Netherlands, and 9 more places. Rare in France, Poland, Israel, and 11 more places.
1 in 112 boys born in Northern Ireland in 2025. Number 18 there.
1 in 250, Ireland
Say it RY-un
Rose and fell with Isaac · As common as Isaac
Common across three Canadian provinces, Ireland, Northern Ireland, and 3 more places. Rare in France, England and Wales, Italy, and 16 more places.
1 in 250 boys born in Ireland in 2025. Number 57 there.
1 in 949, Ireland
Say it TY-ler
Rose and fell with Isaac
Rare in all 24 places we hold figures for.
1 in 949 boys born in Ireland in 2025. Number 188 there.
1 in 137, Scotland
Say it MAKS
Rose and fell with Isaac · As common as Isaac
Common across the UK, the Netherlands, three Nordic countries, and 17 more places. Rare in France, Italy, Poland, and 4 more places.
1 in 137 boys born in Scotland in 2025. Number 25 there.
1 in 209, England and Wales
Say it EZ-ruh
Same generation as Isaac · As common as Isaac
Common in England and Wales, the Netherlands, Ontario, and 7 more places. Rare in France, Italy, Poland, and 16 more places.
1 in 209 boys born in England and Wales in 2025. Number 38 there.
1 in 82, Northern Ireland
Say it JOOD
Same generation as Isaac · As common as Isaac
Loved in Northern Ireland. Common in England and Wales, Ireland, Scotland, and 5 more places. Rare in France, Italy, Poland, and 16 more places.
1 in 82 boys born in Northern Ireland in 2025. Number 9 there.
1 in 64, Austria
Say it ee-LY-us
As common as Isaac · Hebrew, like Isaac
Loved across Austria, Switzerland, four German cities, and 2 more places. Common across England and Wales, three Canadian provinces, the Netherlands, and 11 more places. Rare in France, Italy, Poland, and 5 more places.
1 in 64 boys born in Austria in 2025. Number 4 there.
How this list is scored
How this list is scored
Boy names that sit well beside Isaac, ranked by the fit engine: names whose popularity moves with Isaac's, from the same era, about as common and with shared origins. Rhymes, shared first letters and matching endings count against. Official birth statistics, not forum votes.
Each candidate scores at most about 52 points against the sibling: 22.5 when the two names' popularity curves moved together across regions and decades, up to 13.5 for a similar median birth year, up to 9 for similar popularity, and about 7 for a shared origin. A rhyme costs 27 points and a matching two-letter ending 4.5. Spellings of the sibling's own name and names on the same stem are never suggested. Only one spelling of each name is listed; the others are shown underneath.
Scores use official birth statistics from 40 regions and origins from Wiktionary. How these figures are computed.