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In the entire world, Alja (Alja , الجا ) is quite a rare dominantly female, but seldom male given name. The first name Alja is habitual in Slovenia, where it is quite a common feminine name, Sierra Leone, where it is quite a rare girly name, and the Democratic Republic of the Congo, where it is a rare female name. Much less frequently, Alja is the last name as well as the forename.