"Cú Chulainn, or just Cú for short". Last of Cullan's hounds, Shield of Ulster and Child of Light. There are many colorful names that could follow, but here in this world, they're entirely meaningless - aside for the memory and worth they have for him.

True names hold great power and with that great danger, and if Faerie are any example, that rule also applies here. Still, he'll take that risk. "To be entirely honest, I do like it much better than that nickname.