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In the entire world, Oja (Oja , Оя , Ойя ) is quite a rare epicene given name. The given name Oja is characteristic of Nigeria, where it is a rare epicene name, Indonesia, and Egypt, where it is a rare feminine name. Measured by absolute frequency, it is commonest in India, Nigeria, and Indonesia. More frequently, Oja is the last name as well as the forename.