Kaius
Kaius was the 1029th most popular name for boys in 2025, given to 216 babies. Its best year was 2020, when it ranked 1023rd; the most babies were born in 2025 (216). Over the last ten years it has moved up 479 places. More babies were named Kaius in the 2020s than in any other decade.
Meaning Not yet researched how we research meanings
- Rank in 2025
- #1,029 boys, down 6 places since 2020
- Babies in 2025
- 216boys
- Girls and boys
- Almost always a boy’s name2021–2025
- Peak year
- 2025216 babies
- Total since 1880
- 2,011babies recorded
Kaius popularity since 1880
| Year | Rank (boys) | Babies (boys) |
|---|---|---|
| 2025 | #1,029 | 216 |
| 2020 | #1,023 | 202 |
| 2010 | #6,207 | 14 |
| 2000 | — | — |
| 1990 | — | — |
| 1980 | — | — |
| 1970 | — | — |
| 1960 | — | — |
| 1950 | — | — |
| 1940 | — | — |
| 1930 | — | — |
| 1920 | — | — |
| 1910 | — | — |
| 1900 | — | — |
| 1890 | — | — |
| 1880 | — | — |
How popular is Kaius, counting every spelling?
Kaius is the most common spelling of a name family that ranked #599 for boys in 2025 once every spelling is counted together, compared with #1,029 for Kaius on its own. Together these spellings went to 470 boys in 2025.
| Spelling | Babies 2025 | Official rank | Babies 2021–2025 |
|---|---|---|---|
| Kaius | 216 | #1,029 | 948 |
| Caius | 254 | #927 | 888 |
Spellings count together when they sound the same in American English and are used for the same sex; nicknames and forms that sound different (such as Theo and Theodore) are kept apart. How we group spellings.
How many kids will share the name Kaius?
216 of the 3,606,400 babies born in the US in 2025 were named Kaius (0.06 per 1,000 births). For a boy named Kaius born in 2025, the chance that another child with the same name is in a class of 20 children the same age is under 1 in 50. If every grade liked the name as much as the 2025 babies do, only about one elementary school in 39 (of 430 pupils) would have a child named Kaius.
Shares of all registered births (NCHS); classes assumed to be children born the same year. How we estimate this.
How old are people named Kaius?
About 2,000 people born in the US named Kaius are alive today, with a median age of 6; half are between 3 and 9. That makes Kaius a young name: most people with it are children.
Babies given the name each year (SSA) times the share of that birth year still alive (SSA life tables). Counts people born in the US only. Method.
Kaius by state
How common Kaius was among boys born in each state in 2021–2025. It is notably more common than nationally in Missouri (1.7×). In 24 states fewer than five boys a year got the name, too few for SSA to publish, so those states show as zero.
Names with a similar history
These names rose and fell in step with Kaius: their share of US boys followed the most similar curve since 1880. If you like Kaius, they share its era and feel.
Questions about the name Kaius
How popular is the name Kaius?
Kaius was the 1029th most popular name for boys in 2025, given to 216 babies. Its best year was 2020, when it ranked 1023rd; the most babies were born in 2025 (216). Over the last ten years it has moved up 479 places. More babies were named Kaius in the 2020s than in any other decade.
Is Kaius a boy or girl name?
In 2021–2025, almost always a boy’s name given the name Kaius in the US.
Where is Kaius most popular?
In 2021–2025, Kaius was most common in Hawaii (0.32 per 1,000 boys), followed by Missouri and South Carolina.