Caitlyn vs Lilly
Caitlyn and Lillycompared 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.
New South Wales, Australia · Girls
In 2007, Caitlyn was ranked #98 and Lilly #37 among girls in New South Wales, Australia.
New Zealand · Girls
In 2008, Caitlyn was ranked #94 and Lilly #78 among girls in New Zealand.
Republic of Ireland · Girls
In 2024, Caitlyn was ranked #898 and Lilly #123 among girls in Republic of Ireland.
England and Wales · Girls
In 2024, Caitlyn was ranked #1449 and Lilly #130 among girls in England and Wales.
Northern Ireland · Girls
In 2024, Caitlyn was ranked #407 and Lilly #227 among girls in Northern Ireland.
Caitlyn and Lilly over time
Caitlyn and Lilly appear together in 3 published lists, across 68 years of shared records. Lilly held the stronger position in more years in 3 of them, Caitlyn 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.
Caitlyn reached its own highest recorded position earlier in 3 of those lists, and Lilly 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.
- Mirrored each other
Over 25 shared years in Republic of Ireland · Girls, Lilly rose about as far as Caitlyn fell — from #439 and #439 in 1999 to #898 and #123 in 2024.
List by list
England and Wales · Girls29 shared years, 1996–2024
Caitlyn held the stronger position in 7 of those years, Lilly in 22.
Highest recorded here: Caitlyn #144 in 2005, Lilly #27 in 2011.
The order between them never changed and held in this list.
Most recent shared year, 2024: Caitlyn #1449, Lilly #130.
Republic of Ireland · Girls25 shared years, 1999–2024
Caitlyn held the stronger position in 3 of those years, Lilly in 21.
Highest recorded here: Caitlyn #225 in 2003, Lilly #75 in 2012.
The order between them never changed and held in this list.
Most recent shared year, 2024: Caitlyn #898, Lilly #123.
Northern Ireland · Girls14 shared years, 2005–2024
Caitlyn held the stronger position in 4 of those years, Lilly in 9.
Highest recorded here: Caitlyn #138 in 2005, Lilly #106 in 2011.
The order changed in 2009: Lilly moved ahead. In 2008 they stood at #138 and #171; by 2009 that had become #224 and #224.
Most recent shared year, 2024: Caitlyn #407, Lilly #227.
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 | Caitlyn | Lilly |
|---|---|---|
| Record type | Official statistical record (evidence-only) | Official statistical record (evidence-only) |
| Gender usage | female | female |
| Meaning | Not yet recorded | Not yet recorded |
| Origin | Not yet recorded | Not yet recorded |
| Pronunciation | Not yet recorded | |
| Syllables | 2 | 2 |
| Common variants / nicknames | Not yet recorded | Not yet recorded |
| Recorded regional usage | AU-NSW, GB-ENW, GB-NIR, IE, NZ | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ |
| Most recent popularity observation | Northern Ireland · Girls #407 (2024) | Norway · Girls #38 (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
- Caitlyn and Lilly both have 2 syllables.
- Both names have recorded usage in AU-NSW, GB-ENW, GB-NIR, IE, NZ.
How each name got here
Caitlyn
Popularity journey
First recorded1996
First recorded at #686 among girls in England and Wales in 1996 — the earliest year that source publishes this name, not necessarily the earliest it was used.
England and Wales · Girls
Highest recorded1999–2008
Highest recorded position: #66 among girls in New Zealand, in 2007 (recorded 1999–2008).
New Zealand · Girls
Most recent2024
Most recently recorded at #1449 among girls in England and Wales, in 2024.
England and Wales · Girls
Lilly
Popularity journey
First recorded1945
First recorded at #150 among girls in Norway in 1945 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Norway · Girls
Highest recorded1996–2024
Highest recorded position: #27 among girls in England and Wales, in 2011 (recorded 1996–2024).
England and Wales · Girls
Most recent2025
Most recently recorded at #38 among girls in Norway, in 2025.
Norway · Girls