Cú Chulainn, Hound of Culainn, if you have to be literal.

[ His reaction to having his name used against him as a potential insult comes from his short-fuse about it. ]

Look. Names have meanings, they always did. You drop the "dog" and I'm won't be calling you deer-loving-one [ Of course, Oscar could be also "spear of god" but he is going for the funnier interpretation ]