Ciaran vs Jack
Ciaran and Jackcompared 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.
Republic of Ireland · Boys
In 2025, Ciaran was ranked #372 and Jack #2 among boys in Republic of Ireland.
Northern Ireland · Boys
In 2024, Ciaran was ranked #216 and Jack #4 among boys in Northern Ireland.
Scotland · Boys
In 2024, Ciaran was ranked #191 and Jack #7 among boys in Scotland.
England and Wales · Boys
In 2024, Ciaran was ranked #800 and Jack #22 among boys in England and Wales.
Ciaran and Jack over time
Ciaran and Jack appear together in 3 published lists, across 109 years of shared records. Jack held the stronger position in more years in 3 of them, Ciaran 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.
Each reached its own highest recorded position first in 1 of the lists they share.
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 moved ahead of the other
In 1995, Jack moved ahead of Ciaran in Republic of Ireland · Boys — #29 and #33 the year before became #27 and #19.
- Longest-running competitions
Ciaran and Jack were both ranked in Republic of Ireland · Boys for 52 years, from 1970 to 2025, ending at #372 and #2.
- Peaked in the same years
Both reached their highest recorded position in Republic of Ireland · Boys within 2 years — Ciaran #23 in 2000, Jack #1 in 2000.
List by list
Republic of Ireland · Boys52 shared years, 1970–2025
Ciaran held the stronger position in 22 of those years, Jack in 30.
Highest recorded here: Ciaran #23 in 2000, Jack #1 in 2000.
The order changed in 1995: Jack moved ahead. In 1994 they stood at #29 and #33; by 1995 that had become #27 and #19.
Most recent shared year, 2025: Ciaran #372, Jack #2.
England and Wales · Boys29 shared years, 1996–2024
Ciaran held the stronger position in 0 of those years, Jack in 29.
Highest recorded here: Ciaran #107 in 2004, Jack #1 in 1996.
The order between them never changed and held in this list.
Most recent shared year, 2024: Ciaran #800, Jack #22.
Northern Ireland · Boys28 shared years, 1997–2024
Ciaran held the stronger position in 0 of those years, Jack in 28.
Highest recorded here: Ciaran #26 in 1998, Jack #1 in 2001.
The order between them never changed and held in this list.
Most recent shared year, 2024: Ciaran #216, Jack #4.
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 | Ciaran | Jack |
|---|---|---|
| Record type | Editorially researched profile | Editorially researched profile |
| Gender usage | male | male |
| Meaning | The unaccented catalogue spelling of Ciarán, a diminutive of Ciar ('black, dark') — borne by two 6th-century Irish saints, Ciarán the Elder (founder of Saighir) and Ciarán the Younger (founder of Clonmacnoise). | God is gracious (via John), though now used as an independent name. |
| Origin | Irish, from Old Irish ciar ('dark') | English, historically a diminutive of John |
| Pronunciation | /ˈciə.ɾˠaːnˠ/ | /ˈdʒæk/ |
| Syllables | 2 | 1 |
| Common variants / nicknames | Ciarán, Kieran, Kieron, Kyran | Jankin |
| Recorded regional usage | GB-ENW, GB-NIR, GB-SCT, IE | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ |
| Most recent popularity observation | Republic of Ireland · Boys #372 (2025) | Republic of Ireland · Boys #2 (2025) |
| Pronunciation clarity (demonstration score) | 90/100 | 90/100 |
| Spelling simplicity (demonstration score) | 88/100 | 95/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | high | high |
What the data shows
- Ciaran is recorded with a Irish, from Old Irish ciar ('dark') origin, while Jack is recorded with a English, historically a diminutive of John origin.
- Ciaran has 2 syllables, compared with 1 for Jack.
- Ciaran's recorded meaning differs from Jack's — see the table above for each.
- Both names have recorded usage in GB-ENW, GB-NIR, GB-SCT, IE.
How each name got here
Ciaran
Popularity journey
First recorded1964
First recorded at #49 among boys in Republic of Ireland in 1964 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Republic of Ireland · Boys
Highest recorded1964–2025
Highest recorded position: #23 among boys in Republic of Ireland, in 2000 (recorded 1964–2025).
Republic of Ireland · Boys
Most recent2025
Most recently recorded at #372 among boys in Republic of Ireland, in 2025.
Republic of Ireland · Boys
Jack
Popularity journey
First recorded1945
First recorded at #171 among boys in Norway in 1945 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Norway · Boys
Highest recorded1996–2024
Highest recorded position: #1 among boys in England and Wales, in 1996 (recorded 1996–2024).
England and Wales · Boys
Most recent2025
Most recently recorded at #10 among boys in New South Wales, Australia, in 2025.
New South Wales, Australia · Boys