"the Netherlands," early 14c., from Dutch Holland, probably Old Dutch holt lant "wood land," describing the district around Dordrecht, the nucleus of Holland. Technically, just one province of the Netherlands, but in English use extended to the whole nation.
Old English hleo "shelter, cover, defense, protection," from Proto-Germanic *khlewaz (cf. Old Norse hle, Danish læ, Old Saxon hleo, Dutch lij "lee, shelter"). No known cognates outside Germanic; original sense uncertain and might have been "warm" (cf. German lau "tepid," Old Norse hly "shelter, warmth"), which might link it to PIE *kele- (1) "warm." As an adjective, 1510s, from the noun.
A part of The Netherlands. Holland is a common name for the entire country.