Naruto base isn't google.
But the google response
"First off, forget about its coming from 'humando..' That's an infrequently used form of the verb humare, meaning 'to bury.' Without going into detail, 'humando' means 'something which must be buried.'
The word is from Latin 'humanus.' That, in turn, is from the root 'hom-' (meaning: man) plus the suffix '-anus' (meaning: pertaining to). The original 'homanus' was an adjective meaning 'pertaining to a man.' An internal 'o' in Latin might be rendered by a 'u', and the spelling evolved to 'humanus' and then, through French, to English 'human.'"