Cillian vs Kaci
Cillian and Kacicompared on official birth-registration statistics and Namewise's recorded data. This page states what each name's record shows — it never picks a winner or scores one name against the other.
Head to head
Ranks are only compared within one published list and one year. Two ranks from different years, from a boys' and a girls' list, or from different registrars are not comparable, so they are not placed side by side.
England and Wales · Boys
In 2021, Cillian was ranked #274 and Kaci #3451 among boys in England and Wales.
Cillian and Kaci over time
Cillian and Kaci appear together in 1 published list, across 18 years of shared records. Cillian held the stronger position in more years in 1 of them, Kaci in 0.
The order between them changed and held in one of those lists — a change in that published list, never a claim that one name displaced the other.
Kaci reached its own highest recorded position earlier in 1 of those lists, and Cillian in none. Each position is a place inside its own list, so this compares when they peaked and never how high.
Counted list by list. Two names in the same published list are measured on the same scale in the same year, so those comparisons are real — but positions from different lists are not, so nothing here is combined into an overall standing.
List by list
England and Wales · Boys18 shared years, 1999–2021
Cillian held the stronger position in 15 of those years, Kaci in 3.
Highest recorded here: Cillian #274 in 2021, Kaci #1595 in 2001.
The order changed in 2005: Cillian moved ahead. In 2004 they stood at #3009 and #1878; by 2005 that had become #1190 and #3849.
Most recent shared year, 2021: Cillian #274, Kaci #3451.
Two names moving past each other in a ranking is a fact about the ranking. Namewise does not claim one name displaced the other, that families chose between them, or that either influenced the other — none of that is in this data.
Side by side
| Field | Cillian | Kaci |
|---|---|---|
| Record type | Editorially researched profile | Official statistical record (evidence-only) |
| Gender usage | male | female |
| Meaning | Probably from Old Irish 'cell' (church) combined with a diminutive suffix. | Not yet recorded |
| Origin | Irish | Not yet recorded |
| Pronunciation | Not yet recorded | Not yet recorded |
| Syllables | 2 | 2 |
| Common variants / nicknames | Not yet recorded | Not yet recorded |
| Recorded regional usage | GB-ENW, GB-NIR, GB-SCT, IE | GB-ENW, GB-NIR, GB-SCT, IE |
| Most recent popularity observation | Republic of Ireland · Boys #9 (2025) | Republic of Ireland · Girls #736 (2024) |
| Pronunciation clarity (demonstration score) | Not yet recorded | Not yet recorded |
| Spelling simplicity (demonstration score) | 82/100 | 95/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | medium |
What the data shows
- Cillian has a recorded origin (Irish); Kaci does not have one recorded yet.
- Cillian and Kaci both have 2 syllables.
- A meaning is recorded for Cillian; Kaci doesn't have one written yet.
- Both names have recorded usage in GB-ENW, GB-NIR, GB-SCT, IE.
How each name got here
Cillian
Popularity journey
First recorded1970
First recorded at #305 among boys in Republic of Ireland in 1970 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Republic of Ireland · Boys
Highest recorded1997–2024
Highest recorded position: #2 among boys in Northern Ireland, in 2024 (recorded 1997–2024).
Northern Ireland · Boys
Most recent2025
Most recently recorded at #9 among boys in Republic of Ireland, in 2025.
Republic of Ireland · Boys
Kaci
Popularity journey
First recorded1998
First recorded at #3848 among girls in England and Wales in 1998 — the earliest year that source publishes this name, not necessarily the earliest it was used.
England and Wales · Girls
Highest recorded2001–2018
Highest recorded position: #123 among girls in Northern Ireland, in 2011 (recorded 2001–2018).
Northern Ireland · Girls
Most recent2024
Most recently recorded at #2771 among girls in England and Wales, in 2024.
England and Wales · Girls