Came across a baby in a video that had been named Cornelius by his parents. There's two things I know called Cornelius, one is an elephant and the other is on a box of corn flakes.
I know it as a last name, but not a first name. OTOH, one of my aunts named one of her sons her maiden name. As in his name was <MaidenName> <LastName> - think Smith Jones, for example, but neither actual name is quite that common.