My son is called Cornelius! Third son so we had already used a lot of other boys' names we liked.
We have Irish background, where the name is more popular, but even so when my dad suggested it, we put it at the bottom of our list.
Then when DS3 was born, quickly and loudly, we couldn't make any other name fit! He just wasn't Gabriel, Dashiell, Raphael, Robin, Seth - he really was Cornelius!
He is now 4, a very loud but super kind kid, with wild hair and a strong will. People say he 'owns' his name. It certainly seems to suit him!
Nickname tricky though I imagine Con when older. His older brothers still call him Kit sometimes because they thought he was scrunched-up eyes closed tight like a kitten when he was a baby.