Skull Violence = Skallevold, could also be translated as headbutt violence.
The names? Stuff like Nøtterøy, Tolvsrød, Ringshaug, Jarlsberg, Trælleborg, etc.
I have heard the names so often since my birth, but then I began to think about their actual meaning.
Like if your local beach was called Skullviolence, and you never thought about it.