107,593births recorded
13Countries
3Variants
1945Peak · South Australia
#544Catalonia 2025
Kay is a girl name family recorded 107,593 times in 13 countries since 1882. It ranks highest today in Catalonia (#544 in 2025). Its all-time peak was in South Australia in 1945, at 569.8 births per 100,000.
Popularity by country
Births per 100,000 newborns, all forms of the name combined.
Which form wins where
Births per 100,000 newborns for each form, in the selected country.
Rank in countries that publish top lists only
All forms of Kay
| Variants | Language | Total births | Country | Latest rank | Peak year | 10-year trend |
|---|---|---|---|---|---|---|
| Kay | English | 102,545 | 🇺🇸 United States | #3903 | 1939 | ▲ 3 % |
| Kay | English | 1,652 | 🇦🇺 New South Wales | – | 1952 | – |
| Kay | English | 688 | 🇦🇺 South Australia | – | 1945 | – |
| Kay | English | 548 | 🏴 Scotland | – | 1975 | – |
| Kay | English | 436 | 🏴 England & Wales | – | 1996 | – |
| Kay | English | 217 | 🇨🇭 Switzerland | – | 2002 | – |
| Cai | English | 495 | 🇺🇸 United States | #8362 | 2020 | ▼ 47 % |
| Cai | English | 5 | 🏴 England & Wales | – | 2005 | – |
| Khai | English | 486 | 🇺🇸 United States | #4352 | 2024 | ▲ 39 % |
How we grouped these names
- Kay ↔ Cai — spelling variant
- Kay ↔ Khai — spelling variant
Questions about Kay
How popular is the name Kay?
In 2025 it ranked #544 in Catalonia. Official registers record 107,593 births across 13 countries.
What is Kay in other languages?
Cai (English); Khai (English).
When was Kay most popular?
It peaked in South Australia in 1945, at 569.8 births per 100,000.
Is Kay a boy or a girl name?
In official birth registers, Kay is a girl name.