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It goes back to Latin:
"a human being," 1530s, from human (adj.). Its Old English equivalent, guma, survives only in disguise in bridegroom.
human (adj.) humain, humaigne, "human," from Old French humain, umain (adj.) "of or belonging to man" (12c.), from Latin humanus "of man, human," also "humane, philanthropic, kind, gentle, polite; learned, refined, civilized." This is in part from PIE *(dh) ghomon-, literally "earthling, earthly being," as opposed to the gods (see homunculus). Compare Hebrew adam "man," from adamah "ground." Cognate with Old Lithuanian zmuo (accusative zmuni) "man, male person."
Human interest is from 1824. Human rights attested by 1680s; human being by 1690s. Human relations is from 1916; human resources attested by 1907, American English, apparently originally among social Christians and based on natural resources.