Lewin

From an English surname which was derived from the given name LEOFWINE.

LEOFWINE   male   Anglo-Saxon
Means "dear friend", derived from the Old English elements leof "dear, agreeable, beloved" and wine "friend". This was the name of an 8th-century English saint, also known as Lebuin, who did missionary work in Frisia.
OTHER FORMS
ANCIENT GERMANIC: Leobwin
ANGLO-SAXON: Leofwine
FLEMISH: Lieven, Lievin