Cillian vs Lewis
Cillian and Lewiscompared 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.
Northern Ireland · Boys
In 2024, Cillian was ranked #2 and Lewis #136 among boys in Northern Ireland.
Republic of Ireland · Boys
In 2025, Cillian was ranked #9 and Lewis #432 among boys in Republic of Ireland.
Scotland · Boys
In 2024, Cillian was ranked #83 and Lewis #28 among boys in Scotland.
England and Wales · Boys
In 2025, Cillian was ranked #217 and Lewis #231 among boys in England and Wales.
Cillian and Lewis over time
Cillian and Lewis appear together in 3 published lists, across 99 years of shared records. Lewis held the stronger position in more years in 2 of them, Cillian in 1.
The order between them changed and held in 2 of those lists — a change in that published list, never a claim that one name displaced the other.
Lewis reached its own highest recorded position earlier in 3 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.
How this pair is related
The relationship kinds these two qualify for, each under its own stated rule. Every one is drawn from a list they both appear in.
- One took the other's place near the top
In Northern Ireland · Boys, Cillian moved into the top 50 at #25 in 2015 as Lewis fell out of it to #51, having been #46 the year before.
- One moved ahead of the other
In 2024, Cillian moved ahead of Lewis in England and Wales · Boys — #204 and #179 the year before became #177 and #216.
- Mirrored each other
Over 28 shared years in Northern Ireland · Boys, Cillian rose about as far as Lewis fell — from #179 and #75 in 1997 to #2 and #136 in 2024.
- Longest-running competitions
Cillian and Lewis were both ranked in England and Wales · Boys for 30 years, from 1996 to 2025, ending at #217 and #231.
List by list
Republic of Ireland · Boys41 shared years, 1980–2025
Cillian held the stronger position in 41 of those years, Lewis in 0.
Highest recorded here: Cillian #4 in 2024, Lewis #125 in 2017.
The order between them never changed and held in this list.
Most recent shared year, 2025: Cillian #9, Lewis #432.
England and Wales · Boys30 shared years, 1996–2025
Cillian held the stronger position in 2 of those years, Lewis in 28.
Highest recorded here: Cillian #177 in 2024, Lewis #10 in 2001.
The order changed in 2024: Cillian moved ahead. In 2023 they stood at #204 and #179; by 2024 that had become #177 and #216.
Most recent shared year, 2025: Cillian #217, Lewis #231.
Northern Ireland · Boys28 shared years, 1997–2024
Cillian held the stronger position in 12 of those years, Lewis in 16.
Highest recorded here: Cillian #2 in 2024, Lewis #20 in 2008.
The order changed in 2015: Cillian moved ahead. In 2014 they stood at #48 and #46; by 2015 that had become #25 and #51.
Most recent shared year, 2024: Cillian #2, Lewis #136.
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 | Lewis |
|---|---|---|
| Record type | Editorially researched profile | Official statistical record (evidence-only) |
| Gender usage | male | male |
| 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, NZ |
| Most recent popularity observation | Republic of Ireland · Boys #9 (2025) | England and Wales · Boys #231 (2025) |
| Pronunciation clarity (demonstration score) | Not yet recorded | Not yet recorded |
| Spelling simplicity (demonstration score) | 82/100 | 94/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | medium |
What the data shows
- Cillian has a recorded origin (Irish); Lewis does not have one recorded yet.
- Cillian and Lewis both have 2 syllables.
- A meaning is recorded for Cillian; Lewis 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 #217 among boys in England and Wales, in 2025.
England and Wales · Boys
Lewis
Popularity journey
First recorded1969
First recorded at #291 among boys in Republic of Ireland in 1969 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Republic of Ireland · Boys
Highest recorded1996–2025
Highest recorded position: #10 among boys in England and Wales, in 2001 (recorded 1996–2025).
England and Wales · Boys
Most recent2025
Most recently recorded at #231 among boys in England and Wales, in 2025.
England and Wales · Boys