köken: From Middle High German bluot, from Old High German bluot, from Proto-West Germanic *blōd, from Proto-Germanic *blōþą, of uncertain origin. Cognates include Bavarian Bluat, Low German Bloot, Dutch bloed, English blood, Danish and Swedish blod and Gothic 𐌱𐌻𐍉𐌸 (blōþ).
key (an object that goes into the keyhole and as it turns left or right it locks or unlocks a door, drawer, etc.) · wrench · keystone (a central wedge-shaped piece of an arch or dome that locks the other pieces in place)
çekim: çoğul κλειδιά · tamlayan κλειδιού
köken: From Byzantine Greek κλειδίν (kleidín), from Ancient Greek κλειδίον (kleidíon), diminutive of κλείς (kleís), from Proto-Hellenic *klāwī́ds, from Proto-Indo-European *kleh₂u- (“nail, pin, hook - instruments, of old use for locking doors”).
Borrowed from Middle Low German kīl (“wedge”), possibly but not necessarily through Swedish kil (“wedge”). Even an older Proto-Germanic borrowing has been suggested, but this runs into phonetic difficulties (the Low German word derives from earlier *kīþla-).