I think you're onto something, but the only actual townland I can find is Stanalane, in County Antrim.
Specifically, in Dunluce parish, Barony of Dunluce Lower, Coleraine Poor Law Union. One of several old forms for its name is Standulon (17th C).
Note also a place called Stanalin in County Londonderry, in the townland of Bellemont More, Ballyaghran parish, Barony of North East Liberties of Coleraine, Coleraine Poor Law Union.