Oxford says the Middle English term luke appears to be derived from hléow, an Old English adjective meaning warm, sunny, or sheltered. The Old English word is t

Oxford says the Middle English term luke appears to be derived from hléow, an Old English adjective meaning warm, sunny, or sheltered. The Old English word is the source of lew, a Middle English adjective that meant lukewarm and later appeared in the phrase lew-warm, which survives in dialectal English. I could be wrong but it sounds like the same root at lee/leeward? Logically being in the lee of something would be associated with warmth. Edit: yes https://www.etymonline.com/word/lee https://www.etymonline.com/word/lee Edit 2: if the opposite of leeward is windward, the opposite of lukewarm would be windcool