Declan vs Zac
Declan and Zaccompared 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 · Boys
In 2010, Declan was ranked #81 and Zac #78 among boys in New South Wales, Australia.
New Zealand · Boys
In 2011, Declan was ranked #98 and Zac #90 among boys in New Zealand.
Scotland · Boys
In 2024, Declan was ranked #404 and Zac #176 among boys in Scotland.
Northern Ireland · Boys
In 2024, Declan was ranked #256 and Zac #216 among boys in Northern Ireland.
Republic of Ireland · Boys
In 2025, Declan was ranked #348 and Zac #223 among boys in Republic of Ireland.
England and Wales · Boys
In 2024, Declan was ranked #371 and Zac #442 among boys in England and Wales.
Declan and Zac over time
Declan and Zac appear together in 3 published lists, across 81 years of shared records. Zac held the stronger position in more years in 3 of them, Declan in 0.
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.
Declan reached its own highest recorded position earlier in 3 of those lists, and Zac 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 moved ahead of the other
In 2023, Zac moved ahead of Declan in Northern Ireland · Boys — #234 and #264 the year before became #272 and #161.
List by list
England and Wales · Boys29 shared years, 1996–2024
Declan held the stronger position in 13 of those years, Zac in 16.
Highest recorded here: Declan #66 in 2000, Zac #110 in 2010.
The order between them never changed and held in this list.
Most recent shared year, 2024: Declan #371, Zac #442.
Northern Ireland · Boys27 shared years, 1997–2024
Declan held the stronger position in 12 of those years, Zac in 15.
Highest recorded here: Declan #54 in 1997, Zac #88 in 2010.
The order changed in 2023: Zac moved ahead. In 2022 they stood at #234 and #264; by 2023 that had become #272 and #161.
Most recent shared year, 2024: Declan #256, Zac #216.
Republic of Ireland · Boys25 shared years, 2001–2025
Declan held the stronger position in 10 of those years, Zac in 15.
Highest recorded here: Declan #112 in 2002, Zac #179 in 2019.
The order changed in 2011: Zac moved ahead. In 2010 they stood at #189 and #216; by 2011 that had become #204 and #198.
Most recent shared year, 2025: Declan #348, Zac #223.
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 | Declan | Zac |
|---|---|---|
| Record type | Official statistical record (evidence-only) | Official statistical record (evidence-only) |
| Gender usage | male | male |
| Meaning | Not yet recorded | Not yet recorded |
| Origin | Not yet recorded | Not yet recorded |
| Pronunciation | Not yet recorded | Not yet recorded |
| Syllables | 2 | 1 |
| Common variants / nicknames | Not yet recorded | Not yet recorded |
| Recorded regional usage | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NZ | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NZ |
| Most recent popularity observation | Republic of Ireland · Boys #348 (2025) | Republic of Ireland · Boys #223 (2025) |
| Pronunciation clarity (demonstration score) | Not yet recorded | Not yet recorded |
| Spelling simplicity (demonstration score) | 88/100 | 95/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | medium |
What the data shows
- Declan has 2 syllables, compared with 1 for Zac.
- Both names have recorded usage in AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NZ.
How each name got here
Declan
Popularity journey
First recorded1964
First recorded at #23 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: #12 among boys in Republic of Ireland, in 1971 (recorded 1964–2025).
Republic of Ireland · Boys
Most recent2025
Most recently recorded at #348 among boys in Republic of Ireland, in 2025.
Republic of Ireland · Boys
Zac
Popularity journey
First recorded1996
First recorded at #276 among boys in England and Wales in 1996 — the earliest year that source publishes this name, not necessarily the earliest it was used.
England and Wales · Boys
Highest recorded1998–2012
Highest recorded position: #65 among boys in New South Wales, Australia, in 2002 (recorded 1998–2012).
New South Wales, Australia · Boys
Most recent2025
Most recently recorded at #223 among boys in Republic of Ireland, in 2025.
Republic of Ireland · Boys