Katja is a ♀ female name.
Katja is a short variant of the Russian name Jekaterina, which derived from the name Katharina, which is of Greek origin.
Katja means “each of the two” (from Greek “εκάτερος/hekateros”), “pure” (from Greek “καθαρός/katharos”), “torture” (from Greek “αἰκία/aikia”), “one hundred” (from Greek “hekaton/ἑκατόν”) or “far away” (from Greek “hekás/ἑκάς”).