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In the entire world, Gaika (Gaika , Гайка ) is a rare mostly girly, but infrequently boy's forename. The first name Gaika is habitual in Bulgaria, where it is a rare girly name, India, where it is a very rare mostly female, but infrequently male name, and Russia, where it is an extremely rare predominantly boy's, but scarcely female name. More frequently, Gaika is the last name as well as the forename.
Gaika is also a name for the fictitious and mythical characters: Heiko Anrath , the fictional character from the German science fiction novel series Perry Rhodan.