Koby vs Zac
Koby 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 2011, Koby was ranked #100 and Zac #77 among boys in New South Wales, Australia.
Scotland · Boys
In 2024, Koby was ranked #619 and Zac #176 among boys in Scotland.
Northern Ireland · Boys
In 2024, Koby was ranked #404 and Zac #216 among boys in Northern Ireland.
Republic of Ireland · Boys
In 2025, Koby was ranked #509 and Zac #223 among boys in Republic of Ireland.
England and Wales · Boys
In 2024, Koby was ranked #448 and Zac #442 among boys in England and Wales.
Koby and Zac over time
Koby and Zac appear together in 3 published lists, across 49 years of shared records. Zac held the stronger position in more years in 3 of them, Koby in 0.
In none of those lists did their order change and stay changed.
Zac reached its own highest recorded position earlier in 3 of those lists, and Koby 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 28 shared years in England and Wales · Boys, Koby rose about as far as Zac fell — from #2859 and #273 in 1997 to #448 and #442 in 2024.
List by list
England and Wales · Boys28 shared years, 1997–2024
Koby held the stronger position in 0 of those years, Zac in 28.
Highest recorded here: Koby #368 in 2020, Zac #110 in 2010.
The order between them never changed and held in this list.
Most recent shared year, 2024: Koby #448, Zac #442.
Republic of Ireland · Boys12 shared years, 2013–2025
Koby held the stronger position in 0 of those years, Zac in 12.
Highest recorded here: Koby #350 in 2024, Zac #179 in 2019.
The order between them never changed and held in this list.
Most recent shared year, 2025: Koby #509, Zac #223.
Northern Ireland · Boys9 shared years, 2009–2024
Koby held the stronger position in 0 of those years, Zac in 9.
Highest recorded here: Koby #281 in 2014, Zac #117 in 2009.
The order between them never changed and held in this list.
Most recent shared year, 2024: Koby #404, Zac #216.
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 | Koby | 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 | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NZ |
| Most recent popularity observation | Republic of Ireland · Boys #509 (2025) | Republic of Ireland · Boys #223 (2025) |
| Pronunciation clarity (demonstration score) | Not yet recorded | Not yet recorded |
| Spelling simplicity (demonstration score) | 95/100 | 95/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | medium |
What the data shows
- Koby has 2 syllables, compared with 1 for Zac.
- Both names have recorded usage in AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE.
How each name got here
Koby
Popularity journey
First recorded1997
First recorded at #2859 among boys in England and Wales in 1997 — the earliest year that source publishes this name, not necessarily the earliest it was used.
England and Wales · Boys
Highest recorded2008–2011
Highest recorded position: #84 among boys in New South Wales, Australia, in 2008 (recorded 2008–2011).
New South Wales, Australia · Boys
Most recent2025
Most recently recorded at #509 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