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Kaj
Pronounced KY /ΛkaΙͺ/Medium
Meaning: A Danish/Frisian name (Kaj/Kai) β variously linked to 'rejoice' (Latin Gaius), 'the sea' (Hawaiian), and a Frisian root; the meaning is uncertain; routes layeredLow
Popularity in the U.S. Β· SSA data
U.S. births per year (Social Security Administration, 1880βpresent). Pink marker = peak year.
SSA data updated May 2026. How we source & verify this data.
History & Origin
Kaj is a Danish, Swedish, and Frisian name (a spelling of Kai) β variously linked to the Latin Gaius (possibly 'to rejoice'), the Hawaiian kai, 'the sea', and an old Frisian root; the precise origin is debated (routes layered, which we note). A crisp, soft, Scandinavian name (said 'KY', like 'sky'; nickname Kaj).
In the U.S. it appears in Scandinavian families. Rare, of-uncertain-meaning, and crisp.
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Frequently Asked
What does the name Kaj mean?
Kaj is a Danish/Frisian form of Kai; its meaning is uncertain (variously 'rejoice', 'the sea'). The routes are layered.
How do you pronounce Kaj?
It's said KY /ΛkaΙͺ/ β one syllable, like 'sky'.
Is Kaj a boy or girl name?
Kaj is a boy's name.
How popular is Kaj?
Kaj is a rare name in the U.S.