Kaius Boy
How popular is Kaius?
#1,028 boy name in 2025
216 baby boys were named Kaius in the US in 2025, making it the 1028th most popular boy name.
Kaius popularity over time
| Rank in 2025 | #1,028 for boys (▲ 107 from 2024) |
|---|---|
| Babies in 2025 | 216 boys |
| 10-year trend | Rising fast (+96% babies vs 2015) |
| Earlier ranks | #1,502 in 2015, #1,023 in 2020 |
| Peak year | 2025 (216 boys) |
| Highest rank | #1,023 in 2020 |
| First recorded | 2005 |
| Boys vs girls (last 10 years) | 100% boys, 0% girls |
| Chance a classmate shares it | 0.2% in a class of 25 kids born in 2025 |
Kaius counting every spelling
Social Security counts each spelling as its own name. Adding together the spellings that sound alike, the Kaius family of names ranked #583 for boys in 2025 (#655 the year before), with 470 babies in all.
| Spelling | Boys in 2025 | Share |
|---|---|---|
| Kaius | 216 | 46% |
| Caius | 254 | 54% |
Spellings are grouped by how they sound, using our own rules, so a few groupings may not match how your family says the name.
Where Kaius is most popular
Babies named Kaius per 1,000 boys born in each state, 2021 to 2025. Darker means more common.
- Hawaii: 0.3 per 1,000 (5 boys)
- Missouri: 0.2 per 1,000 (26 boys)
- South Carolina: 0.2 per 1,000 (17 boys)
- North Carolina: 0.2 per 1,000 (41 boys)
- Wisconsin: 0.2 per 1,000 (19 boys)
Kaius by decade
Boy names about as popular as Kaius
Questions
- Is Kaius a boy or girl name?
- Kaius is mostly a boy name. Over the last 10 years, 100% of babies named Kaius were boys.
- How popular is the name Kaius?
- 216 baby boys were named Kaius in the US in 2025, making it the 1028th most popular boy name.
- When was Kaius most popular?
- Kaius peaked in 2025, when 216 boys were given the name. Its highest rank was #1,023 in 2020.
- How many people are named Kaius?
- 2,011 babies have been named Kaius in the US since 1880. We estimate about 2,002 of them are alive in 2026, with a median age of 6.
- Where is Kaius most popular?
- From 2021 to 2025, Kaius was most common in Hawaii, at 0.3 of every 1,000 boys born there.
Source: Social Security Administration baby name data, 1880 to 2025 (names given to at least 5 babies of a sex in a year). Living-people and median-age figures are our estimates using US life tables. How we calculate.