Warden
Middle English (originally denoting a guardian or protector): from Anglo-Norman French and Old Northern French wardein, variant of Old French guarden ‘guardian’.
wiktionary
From Middle English wardein, from Anglo-Norman wardein, Old Northern French wardein, from warder(“to guard”), variant of Old French guarder(“to guard”) (whence modern French garder, also English guard), from Proto-Germanic *ward-; related to Old High German wartēn(“to watch”). Compare guardian, French gardien, from Old French guardian, guardein. Compare also ward and reward. Doublet of guardian.
etymonline
warden (n.)
c. 1200, "one who guards," from Old North French wardein, from Frankish *warding- (which became Old French guardenc), from Proto-Germanic *wardon "to watch, guard," from PIE *war-o-, suffixed form of root *wer- (3) "perceive, watch out for." Meaning "governor of a prison" is recorded from c. 1300.
