Dragonball rule

Goku does actually eventually come around to kakarot and embraces his heritage. He never lets it define him tho like other sayaijin try to force him to believe.

It's not entirely dead naming if anything that's the least of it and more him originally not accepting that he must be a murder hobo just because that's "who he is ment to be". He refuses the ideal and the name kakarot is to him what represents that. Cause originally the only people he associates with that name killed him, his friends and hurt his family.

Remember Goku didn't choose to give up the name, he was given it by Vegeta basically. It wasn't something he was trying to to leave behind but something he was refusing to accept.

But over the years the sayaijin of earth redefine what it means to be sayaijin and that's when he starts accepting it. No longer telling people that isn't his name when they use it.

Even using it himself depending on context. Kakarot becomes a name eventually he's proud of as he grows. A name that represents a strong will, and fighting spirit. While Goku continues to be his family name and his connection to his grandfather.

Goku and kakarot are two different facets of the same person.

The story of the name kakarot is a story of accepting your heritage, learning to not blame yourself for the sins of your father and that you can always redefine what it means. A name is what you make of it, and letting it rest dead means that you were not strong enough of will and honor to move on and make it your own.

And no one should allow shame, and external pressure take away from them their name, their heritage and their honor. Your deeds are your own let no one else define you by their own word and actions. You should always take what your ancestors left for you and leave it in a better state for the next generation. So that they may be proud of who came before them, and build onto a foundation as sturdy as rock.

Rest in peace, Akira Toriyama.