Wesley's kinda nice. Not a fan of
Westley though... I'd prn them differently.
Wesley doesn't seem all that common. It's around, but not overused... may be regional though. Could use
Wesley w/ nn West since nns don't have to be exactly like the names... If people can ad y or ie to shortened versions of names to form a nn, there's no reason a t couldn't be added instead.
Westley just doesn't look or feel right though.