Wizards and Warlocks
wizard (n.)
early 15c., "philosopher, sage," from Middle English wys "wise" (see wise (adj.)) + -ard. Compare Lithuanian žynystė "magic," žynys "sorcerer," žynė "witch," all from žinoti "to know." The ground sense is perhaps "to know the future." The meaning "one with magical power, one proficient in the occult sciences" did not emerge distinctly until c. 1550, the distinction between philosophy and magic being blurred in the Middle Ages. As a slang word meaning "excellent" it is recorded from 1922.
warlock (n.)
Old English wærloga "traitor, liar, enemy, devil," from wær "faith, fidelity; a compact, agreement, covenant," from Proto-Germanic wera- (source also of Old High German wara "truth," Old Norse varar "solemn promise, vow"), from PIE root were-o- "true, trustworthy." Second element is an agent noun related to leogan "to lie" (see lie (v.1); and compare Old English wordloga "deceiver, liar").
Original primary sense seems to have been "oath-breaker;" given special application to the devil (c. 1000), but also used of giants andcannibals. Meaning "one in league with the devil" is recorded from c. 1300. Ending in -ck (1680s) and meaning "male equivalent of a witch" (1560s) are from Scottish. Related: Warlockery.
https://www.etymonline.com/word/warlock#etymonline_v_4836