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In all the world, Kaija (Kaj , Kaija , カイヤ ) is quite a rare epicene given name. The first name Kaija is habitual in Northern Europe, particularly Finland, where it is quite a common epicene name, Sweden, where it is quite a rare predominantly boy's, but very seldom feminine name, and Denmark, where it is quite a rare masculine name. Not in comparison with a country's population, it is the most numerous in Sweden, Finland, and India. Very seldom, Kaija is the last name as well as the forename.
Kaija is also a name for the fictitious and mythical characters: Kaj , the fictional character from the Danish children's television show Kaj & Andrea.