Guardian

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late Middle English: from Old French garden, of Germanic origin; compare with ward and warden. The ending was altered by association with -ian.

wiktionary

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From Middle English gardein, garden, (also wardein, > Modern English warden), from Anglo-Norman guardein, from Old French *guardian, gardein, garden, *gardenc, from the verb guarder, of Germanic origin. Compare French gardien. Doublet of warden.

etymonline

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guardian (n.)

"one who guards," early 14c., garden; early 15c., gardein, from Anglo-French gardein (late 13c.), Old French gardien "keeper, custodian," earlier guarden, from Frankish *warding-, from the Germanic source of guard (v.). Specific legal sense is from 1510s. Guardian angel is from 1630s.