The Frank Zappa estate fued is getting very messy. While I do think the children should still be able to use their own name without copyright infringement, I think the motives are a little skewed. The Zappa siblings have all been fighting over the full catalogue of their father's songs since their mother's passing last year. However, since their names were given to them at birth, they should still be able to freely use their names without legal action.
A person should always be able to use their own family name, regardless of the connotations it carries or any trademark issues. A person bearing a surname as their legally given name should have ultimate control over it and corporations should always be forced to take a backseat in cases like this.
Yes, a child born into a family should be able to use the family name to their advantage. After all, it's their name, too! The parents don't own full rights to the name. Children own rights to the name as well. I hope Dweezil wins because Zappa is his name too. It's not the sole property of Frank.
What should Dweezil do in this case? Change his name? This just shows how ridiculous and sue happy we have become. Frank Zappa knew his son was in the entertainment business. Surely, during Frank's lifetime, if he had an issue like this it could have been addressed at that time.