Kai vs Zach
Kai and Zachcompared 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, Kai was ranked #34 and Zach #94 among boys in Republic of Ireland.
Scotland · Boys
In 2024, Kai was ranked #56 and Zach #148 among boys in Scotland.
Northern Ireland · Boys
In 2024, Kai was ranked #69 and Zach #108 among boys in Northern Ireland.
England and Wales · Boys
In 2024, Kai was ranked #72 and Zach #509 among boys in England and Wales.
Kai and Zach over time
Kai and Zach appear together in 3 published lists, across 84 years of shared records. Kai held the stronger position in more years in 2 of them, Zach 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.
Zach reached its own highest recorded position earlier in 2 of those lists, Kai in 1. 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 2020, Kai moved ahead of Zach in Northern Ireland · Boys — #107 and #89 the year before became #64 and #95.
- Repeatedly exchanged positions
Kai and Zach changed places 5 times in Northern Ireland · Boys between 1998 and 2024, ending at #69 and #108.
- Closest over the longest run
Across 27 shared years in Northern Ireland · Boys, Kai and Zach averaged 20.3 places apart, ending at #69 and #108.
- Mirrored each other
Over 29 shared years in England and Wales · Boys, Kai rose about as far as Zach fell — from #161 and #271 in 1996 to #72 and #509 in 2024.
List by list
England and Wales · Boys29 shared years, 1996–2024
Kai held the stronger position in 29 of those years, Zach in 0.
Highest recorded here: Kai #56 in 2003, Zach #167 in 2010.
The order between them never changed and held in this list.
Most recent shared year, 2024: Kai #72, Zach #509.
Republic of Ireland · Boys28 shared years, 1997–2025
Kai held the stronger position in 14 of those years, Zach in 12.
Highest recorded here: Kai #30 in 2024, Zach #81 in 2021.
The order changed in 2013: Kai moved ahead. In 2012 they stood at #109 and #88; by 2013 that had become #85 and #106.
Most recent shared year, 2025: Kai #34, Zach #94.
Northern Ireland · Boys27 shared years, 1998–2024
Kai held the stronger position in 13 of those years, Zach in 13.
Highest recorded here: Kai #52 in 2021, Zach #65 in 2014.
The order changed in 2020: Kai moved ahead. In 2019 they stood at #107 and #89; by 2020 that had become #64 and #95.
Most recent shared year, 2024: Kai #69, Zach #108.
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 | Kai | Zach |
|---|---|---|
| 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 | 1 | 1 |
| Common variants / nicknames | Not yet recorded | Not yet recorded |
| Recorded regional usage | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO | GB-ENW, GB-NIR, GB-SCT, IE |
| Most recent popularity observation | New South Wales, Australia · Boys #23 (2025) | Republic of Ireland · Boys #94 (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
- Kai and Zach both have 1 syllable.
- Both names have recorded usage in GB-ENW, GB-NIR, GB-SCT, IE.
How each name got here
Kai
Popularity journey
First recorded1945
First recorded at #76 among boys in Norway in 1945 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Norway · Boys
Highest recorded2002–2025
Highest recorded position: #20 among boys in New South Wales, Australia, in 2023 (recorded 2002–2025).
New South Wales, Australia · Boys
Most recent2025
Most recently recorded at #23 among boys in New South Wales, Australia, in 2025.
New South Wales, Australia · Boys
Zach
Popularity journey
First recorded1993
First recorded at #302 among boys in Republic of Ireland in 1993 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Republic of Ireland · Boys
Highest recorded1997–2024
Highest recorded position: #65 among boys in Northern Ireland, in 2014 (recorded 1997–2024).
Northern Ireland · Boys
Most recent2025
Most recently recorded at #94 among boys in Republic of Ireland, in 2025.
Republic of Ireland · Boys