My grandmother was born in Dingle. All the Irish side of my family is from Inch, most of their descendents still live on farms near Lispole and Annascaul, but they have always referred to themselves as being from Dingle (a fact that frustrated my genealogy efforts for a long time.)
All the maps I have show the Irish name as well as Dingle and most of the road signs have been double-posted for years.
I'm emailing the relations and I'll let you know what they report from the ground.
Joe(Moynihan-O'Sullivan-Ashe)