Right because the name Chubby was never ever used before the 1960 twist phenomenon.
I remember the film FATSO with Dom Deluise in the 1980s They belonged to a weight watchers style organization called “Chubby Checkers”. Wonder if he suid Brooksfilms over that.
This reminds me of Spike Lee Suing Spike TV.
If he has any kind of copyright protection of his name, he would have a case. Remember, Sarah and Bristol Palin both copyrighted/trademarked their names, or at least applied to get that protection for the use of their names.