What does Selwin mean?
Selwin \s(e)-lwin, sel-win\ as a name for boys. Selwin's name origin is Old English, and the meaning of the name Selwin is "manor-friend". Selwin is a variant of Selwyn (Old English): also a derivation from Silvanus.
Selwin is an uncommonly occurring given name for men. Selwin is an equivalently uncommon last name too for both adults and children. (2000 U.S. Census)
Charted below is the baby name popularity of Selwin for boys. Selwin has not made it into the Top 1000 thus far. (2014 Birth Statistics)