Family name origins & meanings
- German (also Kästl) : from a pet form of the saint’s name Castulus, itself a diminutive of the Latin adjective castus ‘chaste’.
- German (also Kästl) : habitational name from any of various places so named in Bavaria.
- German (also Kästl) : from an old personal name related to Old High German, Middle High German gast ‘guest’, earlier ‘foreign warrior’.