Brother names for Cillian
KIL-ee-un · 3 syllables
Rare in France, England and Wales, Italy, and 18 more places.
Ranked by fit
40 brother names for Cillian, ranked by fit. Add your surname to re-rank.
1 in 71, Ireland
Say it FYUN
Rose and fell with Cillian · Same generation as Cillian
Loved in Ireland. Common in Northern Ireland. Rare in France, England and Wales, Italy, and 19 more places.
1 in 71 boys born in Ireland in 2025. Number 6 there.
1 in 235, Ireland
Say it SHAY
Rose and fell with Cillian · Same generation as Cillian
Common in Ireland. Rare across France, the UK, Italy, and 18 more places.
1 in 235 boys born in Ireland in 2025. Number 52 there.
1 in 44, Ireland
Say it REE-un
Rose and fell with Cillian · Same generation as Cillian · Same ending as Cillian
Loved in Ireland. Common in Northern Ireland. Rare in France, England and Wales, Italy, and 19 more places.
1 in 44 boys born in Ireland in 2025. Number 1 there.
1 in 195, England and Wales
Say it ROH-un
Rose and fell with Cillian · Same generation as Cillian · Same ending as Cillian
Common across the UK, three Canadian provinces, Ireland, and New Zealand. Rare in France, Italy, Poland, and 15 more places.
1 in 195 boys born in England and Wales in 2025. Number 30 there.
1 in 460, Northern Ireland
Say it KOR-mak
Rose and fell with Cillian · Same generation as Cillian · Same initial as Cillian
Rare in all 24 places we hold figures for.
1 in 460 boys born in Northern Ireland in 2025. Number 126 there.
1 in 124, Northern Ireland
Say it SHAY
Rose and fell with Cillian · Irish, like Cillian
Common in Northern Ireland. Rare in France, England and Wales, Italy, and 20 more places.
1 in 124 boys born in Northern Ireland in 2025. Number 22 there.
1 in 143, Ireland
Say it KEE-un
Rose and fell with Cillian · Same generation as Cillian · Same initial as Cillian
Common in Ireland and Northern Ireland. Rare in France, England and Wales, Italy, and 19 more places.
1 in 143 boys born in Ireland in 2025. Number 33 there.
1 in 112, Ireland
Say it KON-er
Rose and fell with Cillian · Irish, like Cillian · Same initial as Cillian
Common in Ireland and Northern Ireland. Rare in France, England and Wales, Italy, and 19 more places.
1 in 112 boys born in Ireland in 2025. Number 16 there.
1 in 139, England and Wales
Say it AL-fee
Rose and fell with Cillian · Same generation as Cillian
Common across the UK, Ireland, and three Australian states. Rare in France, Italy, Poland, and 17 more places.
1 in 139 boys born in England and Wales in 2025. Number 16 there.
1 in 159, Ireland
Say it OL-ee
Rose and fell with Cillian · Same generation as Cillian
Common in Ireland, Scotland, Northern Ireland, and 2 more places. Rare in France, England and Wales, Italy, and 18 more places.
1 in 159 boys born in Ireland in 2025. Number 31 there.
1 in 180, Scotland
Say it KAL-un
Rose and fell with Cillian · Same generation as Cillian · Same initial as Cillian
Common in Scotland. Rare in France, England and Wales, Italy, and 20 more places.
1 in 180 boys born in Scotland in 2025. Number 36 there.
1 in 224, Northern Ireland
Say it KOH-nun
Rose and fell with Cillian · Same generation as Cillian · Same initial as Cillian
Common in Northern Ireland. Rare in France, England and Wales, Italy, and 20 more places.
1 in 224 boys born in Northern Ireland in 2025. Number 61 there.
1 in 91, Scotland
Say it FIN-lee
Rose and fell with Cillian · Same generation as Cillian
Loved in Scotland. Rare in France, England and Wales, Italy, and 20 more places.
1 in 91 boys born in Scotland in 2025. Number 9 there.
1 in 467, England and Wales
Say it EL-is
Rose and fell with Cillian · Same generation as Cillian
Common in England and Wales and Scotland. Rare in France, Italy, Poland, and 19 more places.
1 in 467 boys born in England and Wales in 2025. Number 92 there.
1 in 376, Northern Ireland
Say it DAR-uh
Rose and fell with Cillian · Irish, like Cillian
Rare in all 24 places we hold figures for.
1 in 376 boys born in Northern Ireland in 2025. Number 107 there.
1 in 376, Northern Ireland
Say it ZAK
Rose and fell with Cillian · Same generation as Cillian
Common in Ireland. Rare across France, the UK, Italy, and 18 more places.
1 in 376 boys born in Northern Ireland in 2025. Number 107 there.
1 in 436, Northern Ireland
Say it NY-ul
Rose and fell with Cillian · Irish, like Cillian
Rare in all 24 places we hold figures for.
1 in 436 boys born in Northern Ireland in 2025. Number 120 there.
1 in 828, Northern Ireland
Say it KAY-den
Rose and fell with Cillian · Same generation as Cillian
Rare in all 24 places we hold figures for.
1 in 828 boys born in Northern Ireland in 2025. Number 199 there.
1 in 333, Scotland
Say it FER-gus
Rose and fell with Cillian · Same generation as Cillian
Common in Scotland. Rare in France, England and Wales, Italy, and 20 more places.
1 in 333 boys born in Scotland in 2025. Number 91 there.
1 in 579, Ireland
Say it OH-in
Rose and fell with Cillian · Irish, like Cillian · Same ending as Cillian
Rare in all 24 places we hold figures for.
1 in 579 boys born in Ireland in 2025. Number 132 there.
1 in 879, Ireland
Say it REES
Rose and fell with Cillian · Same generation as Cillian
Rare in all 24 places we hold figures for.
1 in 879 boys born in Ireland in 2025. Number 179 there.
1 in 484, Ireland
Say it KEER-un
Rose and fell with Cillian · Irish, like Cillian · Same initial as Cillian
Rare in all 24 places we hold figures for.
1 in 484 boys born in Ireland in 2025. Number 149 there.
1 in 1,091, Scotland
Say it LAY-tun
Rose and fell with Cillian · Same generation as Cillian
Rare in all 24 places we hold figures for.
1 in 1,091 boys born in Scotland in 2025. Number 226 there.
1 in 68, Ireland
Say it uh-SHEEN
Rose and fell with Cillian · As common as Cillian
Loved in Ireland and Northern Ireland. Rare in France, England and Wales, Italy, and 19 more places.
1 in 68 boys born in Ireland in 2025. Number 5 there.
1 in 289, Scotland
Say it LOK-lun
Rose and fell with Cillian · Same generation as Cillian · Same ending as Cillian
Common in Scotland. Rare in France, England and Wales, Italy, and 20 more places.
1 in 289 boys born in Scotland in 2025. Number 72 there.
1 in 83, Ireland
Say it TYG
Rose and fell with Cillian · Irish, like Cillian
Loved in Ireland. Common in Northern Ireland. Rare in France, England and Wales, Italy, and 19 more places.
1 in 83 boys born in Ireland in 2025. Number 8 there.
1 in 116, Ireland
Say it DAR-uh
Rose and fell with Cillian · Irish, like Cillian
Common in Ireland and Northern Ireland. Rare in France, England and Wales, Italy, and 19 more places.
1 in 116 boys born in Ireland in 2025. Number 19 there.
1 in 166, Northern Ireland
Say it ROR-ee
Rose and fell with Cillian · Irish, like Cillian
Common in Ireland and Northern Ireland. Rare in France, England and Wales, Italy, and 19 more places.
1 in 166 boys born in Northern Ireland in 2025. Number 38 there.
1 in 205, Ireland
Say it KAY-lun
Rose and fell with Cillian · Same initial as Cillian
Common in Ireland. Rare across France, the UK, Italy, and 18 more places.
1 in 205 boys born in Ireland in 2025. Number 43 there.
1 in 727, Scotland
Say it YOO-un
Rose and fell with Cillian · Same generation as Cillian · Same ending as Cillian
Rare in all 24 places we hold figures for.
1 in 727 boys born in Scotland in 2025. Number 163 there.
1 in 212, Northern Ireland
Say it OH-run
Rose and fell with Cillian · Irish, like Cillian · Same ending as Cillian
Common in Ireland and Northern Ireland. Rare in France, England and Wales, Italy, and 19 more places.
1 in 212 boys born in Northern Ireland in 2025. Number 55 there.
1 in 108, England and Wales
Say it FRED-ee
Rose and fell with Cillian · As common as Cillian
Loved in England and Wales. Common in Ireland, Scotland, Northern Ireland, and 2 more places. Rare in France, Italy, Poland, and 17 more places.
1 in 108 boys born in England and Wales in 2025. Number 10 there.
1 in 307, England and Wales
Say it FRANK-ee
Rose and fell with Cillian
Common across the UK and Ireland. Rare in France, Italy, Poland, and 17 more places.
1 in 307 boys born in England and Wales in 2025. Number 56 there.
1 in 345, Northern Ireland
Say it KAY-lun
Rose and fell with Cillian · Irish, like Cillian · Same initial as Cillian
Common in Northern Ireland. Rare in France, England and Wales, Italy, and 20 more places.
1 in 345 boys born in Northern Ireland in 2025. Number 99 there.
1 in 753, Northern Ireland
Say it OR-un
Rose and fell with Cillian · Irish, like Cillian · Same ending as Cillian
Rare in all 24 places we hold figures for.
1 in 753 boys born in Northern Ireland in 2025. Number 185 there.
1 in 307, Northern Ireland
Say it OH-in
Rose and fell with Cillian
Common in Northern Ireland. Rare in France, England and Wales, Italy, and 20 more places.
1 in 307 boys born in Northern Ireland in 2025. Number 86 there.
1 in 302, Scotland
Say it KAR-ter
Same generation as Cillian · As common as Cillian · Same initial as Cillian
Common across England and Wales, three Canadian provinces, Scotland, and 5 more places. Rare in France, Italy, Poland, and 17 more places.
1 in 302 boys born in Scotland in 2025. Number 79 there.
1 in 104, Northern Ireland
Say it FIN
Same generation as Cillian · Irish, like Cillian
Loved in the Netherlands and 1 more place. Common across the UK, Austria, Switzerland, and 12 more places. Rare in France, Italy, Poland, and 7 more places.
1 in 104 boys born in Northern Ireland in 2025. Number 16 there.
1 in 913, England and Wales
Say it AY-den
Same generation as Cillian · As common as Cillian
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 457, Scotland
Say it FLIN
Same generation as Cillian · Irish, like Cillian
Common across Australia. Rare across France, the UK, Italy, and 19 more places.
1 in 457 boys born in Scotland in 2025. Number 116 there.
How this list is scored
How this list is scored
Boy names that sit well beside Cillian, ranked by the fit engine: names whose popularity moves with Cillian'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.