Kasia

Kasia is a Polish short form of Katarzyna, the Polish member of the Katherine family. Its history therefore reaches back to the Greek name Aikaterine, whose original derivation remains uncertain. The familiar meaning pure developed through an association with the Greek word katharos. That is a longstanding interpretation of the family, rather than a literal translation of the letters in Kasia.

In Polish, Kasia has the warmth of a familiar form used for Katarzyna. It can also stand by itself as a given name. The Polish sound of si is softer than the English spelling might suggest, so hearing a Polish speaker say it is useful when choosing a pronunciation. Its five letters preserve a distinctly Polish identity while connecting it to relatives such as Katherine, Katarina, and Katia.