Last name Kaja (Kaja 
, Кая 
, Кайа ) , all over the world, is a common surname. The cognomen Kaja is habitual in Albania, where it is quite a common surname, Slovenia, and Kosovo, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in India, Malaysia, and Albania. Likewise, Kaja is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kaja | Malaysia, Poland, India, Albania, Slovenia |
| Кая | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Кайа | Belarus, Russia, Ukraine |
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kaja widegren Swedish artist (1873-1960), SE (b. 1873) |
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kaja norena Norwegian singer (1884-1968), NO (b. 1884) |
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| kaja lovise johanne jørgensen Norwegian missionary (b. 1847) |
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florian kaja PL (b. 1895) |
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| kaja maartmann NO (b. 1851) |
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| kaja kalisch holocaust victim, b. 1863-12-14, AT (b. 1863) |
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zbigniew kaja Polish painter (1924-1983), PL (b. 1924) |
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kaja mirecka-ploss PL (b. 1924) |
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| kaja fleischer (b. 1876) |
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| kaja larsen Norwegian photographer, NO (b. 1888) |
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kaja kärner Estonian journalist, EE (b. 1953) |
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jan kaja painter, PL (b. 1957) |
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kaja tael Estonian diplomat, EE (b. 1960) |
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kaja lotman Estonian zoologist and conservationist, EE (b. 1960) |
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kaja peterson Estonian zoologist and ecologist, EE (b. 1963) |
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