Early 19th century; earliest use found in John Keats (1795–1821), poet. Either shortened from nephew, or representing colloquial use of regional forms of nephew.
Definition of nevvy in US English:
nevvy
nounˈnɛvi
informal
Nephew.
Origin
Early 19th century; earliest use found in John Keats (1795–1821), poet. Either shortened from nephew, or representing colloquial use of regional forms of nephew.