Guardian etymology in English

English word guardian comes from Anglo-Norman gardin

Dictionary entry	Language	Definition
gardin	Anglo-Norman (xno)
garden	Middle English (1100-1500) (enm)
guardian	English (en)	(legal) A person legally responsible for a minor (in loco parentis).. (legal) A person legally responsible for an incompetent person.. (video games) A major or final enemy; boss.. A superior in a Franciscan monastery.. Someone who guards, watches over, or protects.

Guardian etymology