prefix of reversal, deprivation, or removal (as in unhand, undo, unbutton), Old English on-, un-, from Proto-Germanic *andi- (source also of Old Saxon ant-, Old Norse and-, Dutch ont-, Old High German ant-, German ent-, Gothic and- "against"), from PIE *anti "facing opposite, near, in front of, before, against" (from PIE root *ant- "front, forehead," with derivatives meaning "in front of, before").
More or less confused with un- (1) through similarity in the notions of "negation" and "reversal;" an adjective such as unlocked might represent "not locked" (un- (1)) or the past tense of unlock (un- (2)).
"to bind, fasten, couple, unite as if by links," late 14c., believed to be from link (n.1), though it is attested earlier. Intransitive sense "become connected, join in marriage" is from 1530s. Related: Linked; linking.
<a href="https://www.etymonline.com/word/unlink">Etymology of unlink by etymonline</a>
Harper, D. (n.d.). Etymology of unlink. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/unlink