Where does “cath” come from?

cath (English) comes from English Catherine, from French Catherine, from Medieval Latin Katerina, from Latin Ecaterina, from Ancient Greek Αἰκατερίνη, from Ancient Greek Ἑκάτη, from Ancient Greek ἑκάς, from Ancient Greek ἕ — self.

cath (English): Clipping of cathode; Clipping of catheter;...