Holster

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mid 17th century: corresponding to and contemporary with Dutch holster, of unknown origin.

wiktionary

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From Dutch holster(“pistol-case, holster”), from Middle Low German holster, ultimately from Proto-Germanic *hulastrą, *hulistrą(“hull, case, covering”), cognate with Old English heolstor(“a covering, veil, hiding-place”), Danish hylster(“pistol case, envelope”), Icelandic hulstur(“sheath”), Gothic 𐌷𐌿𐌻𐌹𐍃𐍄𐍂( hulistr, “covering”). Compare German Halfter(“pistol case”). Related to hull, hele.

etymonline

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holster (n.)

"leather case for a pistol," 1660s, probably from Old English heolster, earlier helustr "concealment, hiding place," from Proto-Germanic *hulfti- (source also of Old High German hulft "cover, case, sheath," Old Norse hulstr "case, sheath," Middle Dutch holster, German Halfter "holster"), from PIE root *kel- (1) "to cover, conceal, save." Intermediate forms are wanting, and the modern word could as well be from the Norse or Dutch cognates.

holster (v.)

by 1902, from holster (n.). Related: Holstered; holstering.