My official guess is Fortinbras Took. I don’t know what it means. But I see the FORT in the name and I know that means strength in Latin. How can a baby be strong?
It means "strong in arm" apparently. Another good effort, though a baby could be thought stronger than usual. But I can't imagine how you managed to find that one but missed the actual answer!
I'll enhance the clue. I said this character grew into their inappropriate name. It might be better to say they aged into it.