boy's name
Kaj
KY (Danish)
- Gender Boy
- Syllables 1
- Letters 3
- Popularity Rare
- Births on record 574
Kaj is a boy's name with 1 syllable. In 2025 it was given to 5 babies in the United States. It is a rare choice.
- Peaked in 2006, when 20 babies were given the name.
- It has been falling over the past decade.
- Today about 1 in 663,130 babies in the United States is given this name.
- First appears in US birth records in 1956.
- 1 syllable, with the stress on syllable 1.
Kaj Over Time
Births per decade in the United States, 1950s to 2020s. The striped bar is the 2020s, which so far covers 2020 to 2025.
Show the numbers
| Decade | Births |
|---|---|
| 1950s | 5 |
| 1960s | 30 |
| 1970s | 26 |
| 1980s | 54 |
| 1990s | 74 |
| 2000s | 140 |
| 2010s | 134 |
| 2020s (to 2025) | 52 |
How Popular Is Kaj?
In 2025, Kaj was given to 5 babies in the United States. It is a rare choice.
Where Kaj Is Used
US figures omit any name given to fewer than five babies in a year, so the rarest names are absent from the source rather than absent from use. Data & sources.
Names That Peaked Alongside Kaj
These names rose and fell in the same era, which is why they tend to sound like they belong together.
Parents Who Like Kaj Also Like
Names whose popularity has risen and fallen in step with Kaj over the last century — the same taste, a different name.
How to Say Kaj
- Danish KY
Sibling Names for Kaj
Names from the same era that do not rhyme or share an initial with Kaj — the two things that make a sibling set grate.
Common Questions About Kaj
How popular is the name Kaj?
In 2025, Kaj was given to 5 babies in the United States. It is a rare choice.
Is Kaj a girl's or a boy's name?
Kaj is given almost entirely to boys in birth records.
How many syllables are in Kaj?
Kaj has 1 syllable.
When was Kaj most popular?
Kaj peaked in 2006, when 20 babies were given the name. It has been falling over the past decade.
Is Kaj a good name?
That is not something records can settle, but they can tell you what you would be choosing. Kaj currently ranks #13,173 in the United States. It has been falling over the past decade. Everything else — how it sounds with your surname, who it reminds you of — is yours.