30+ year old established case precedent disagrees with you:

http://law2.umkc.edu/faculty/projects/ftrials/communications...

https://casetext.com/case/waits-v-frito-lay-inc

If they are a celebrity actor it sure is.

Voice actors especially. Voice acting isn't what ScarJo is really "known for" but she's done a ton of work for animated films so her distinct voice really is a part of her livelihood.