Fionn vs Katlyn
Fionn and Katlyncompared 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 · Girls
In 2004, Fionn was ranked #4598 and Katlyn #1312 among girls in England and Wales.
Side by side
| Field | Fionn | Katlyn |
|---|---|---|
| Record type | Editorially researched profile | Official statistical record (evidence-only) |
| Gender usage | male | female |
| Meaning | Traditionally interpreted as 'white' or 'fair', extending in Old Irish usage to 'bright' and figuratively 'true, just'. Strongly associated with the mythological hero Fionn mac Cumhaill. | Not yet recorded |
| Origin | Irish | Not yet recorded |
| Pronunciation | /ˈfɪn/ | Not yet recorded |
| Syllables | 1 | 2 |
| Common variants / nicknames | Not yet recorded | Not yet recorded |
| Recorded regional usage | GB-ENW, GB-NIR, GB-SCT, IE | GB-ENW, GB-NIR, IE |
| Most recent popularity observation | Republic of Ireland · Boys #6 (2025) | England and Wales · Girls #4063 (2017) |
| Pronunciation clarity (demonstration score) | 90/100 | Not yet recorded |
| Spelling simplicity (demonstration score) | 94/100 | 88/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | medium |
What the data shows
- Fionn has a recorded origin (Irish); Katlyn does not have one recorded yet.
- Fionn has 1 syllable, compared with 2 for Katlyn.
- A meaning is recorded for Fionn; Katlyn doesn't have one written yet.
- Both names have recorded usage in GB-ENW, GB-NIR, IE.
How each name got here
Fionn
Popularity journey
First recorded1971
First recorded at #257 among boys in Republic of Ireland in 1971 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Republic of Ireland · Boys
Highest recorded1971–2025
Highest recorded position: #6 among boys in Republic of Ireland, in 2023 (recorded 1971–2025).
Republic of Ireland · Boys
Most recent2025
Most recently recorded at #6 among boys in Republic of Ireland, in 2025.
Republic of Ireland · Boys
Katlyn
Popularity journey
First recorded1997
First recorded at #2738 among girls in England and Wales in 1997 — the earliest year that source publishes this name, not necessarily the earliest it was used.
England and Wales · Girls
Highest recorded1998–2007
Highest recorded position: #213 among girls in Northern Ireland, in 1998 (recorded 1998–2007).
Northern Ireland · Girls
Most recent2017
Most recently recorded at #4063 among girls in England and Wales, in 2017.
England and Wales · Girls