ETYM Old Eng. neveu, nevou, nevu, from French neveu, Old Fren. also, nevou, Latin nepos; akin to AS. nefa, Dutch neef, German neffe, Old High Germ. nevo, Icel. nefi a kinsman, Greek nepodes, pl., brood, young. Related to Niece, Nepotism.
A son of one's brother or sister.