Doonesbury by Garry Trudeau for March 09, 1972
Rufus: Did I tell you I'm thinking of changing my name? Mike: Whatever for? What's wrong with "Rufus"? Rufus: Well...it's a little trite. Every other kid on my block is called "Rufus." I guess it's a cultural thing....anyway, I've decided to get another name...I think I want a name that reflects my enormous strength of character... Mike: Got one yet? Rufus: How does "Thor" grab you?