Kat

Kat is an English short form of Katherine and its many spelling variants, all of which ultimately derive from the Greek name Aikaterine, whose precise root remains debated but is often associated with the Greek word katharos, meaning pure. It has been used as an independent given name in its own right, particularly in modern English-speaking countries. Related forms include Kate, Katy, Kay, and the fuller Katherine, Katharine, and Catherine.