lee (n.) Look up lee at Dictionary.com
Old English hleo "shelter, cover, defense, protection," from Proto-Germanic *khlewaz (cognates: Old Norse hle, Danish , Old Saxon hleo, Dutch lij "lee, shelter"). No known cognates outside Germanic; original sense uncertain and might have been "warm" (compare German lau "tepid," Old Norse hly "shelter, warmth"), which might link it to PIE *kele- (1) "warm." As an adjective, 1510s, from the noun.