köken: From Old French guardian, guardein (“protector, guard”), from an earlier *gardenc, the first root deriving from guarder and the second from Proto-Germanic *-ingaz, cf the similarly-formed Italian guardingo . The suffix was later changed; compare the Learned borrowing from Medieval Latin guardianus, which may have influenced it. Doublet of gardian.
aile: ange gardien, gardien de but, gardien de la paix, gardien de phare, gardien de prison, gardien d'urgence
Inherited from Middle Persian [Book Pahlavi needed] (pʾspʾn' /pāsbān/, “guard, watcher”), which is akin to Old Armenian պահապան (pahapan), an Iranian borrowing.