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Around the globe, Kasja (Kasja , Кася , Κασσιανή ) is a rare gender-neutral first name. The first name Kasja is habitual in Croatia, where it is a rare girly name, Ukraine, where it is a very rare female name, and Indonesia, where it is a very rare masculine name. Measured by absolute frequency, this name is the most popular in Indonesia, Russia, and Ukraine. Likewise, Kasja is the last name as well as the forename.