Perhaps [name_m]Lenny[/name_m], [name_m]Nat[/name_m], or [name_m]Sandy[/name_m]? Stanley’s a hard one to nickname without [name_m]Stan[/name_m] and [name_m]Lee[/name_m]! I hope you can find something that suits. 
I think I’d personally go with [name_m]Lenny[/name_m].