Cognomen Alaja (Alaja 
, Алая 
) , across the world, is quite a rare last name. The family name Alaja is habitual in Finland, where it is a rare surname, Bolivia, and Syria. Measured by absolute frequency, it is the most numerous in Nigeria, India, and Philippines. Also, Alaja is the forename as well as the last name.
| francisco basilio alaja ES (b. 1766) |
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pertti alaja Finnish association football player and coach (1952-2017), FI (b. 1952) |
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| osmo alaja Finnish priest, FI (b. 1915) |
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| erkki alaja Finnish association football player, FI (b. 1952) |
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| aarne alaja FI |
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