My (29f) brother (18m) is changing is name to "Typhoon" with an equally unique last name. My parents are apoplectic. Do I stay out of it or should I try to convey that these are different times and adults have an expectation of autonomy?

Going to try to keep this short as possible. As it is, my parents had 4 girls and when my brother was born he was almost seen as a god delivered from heaven to my dad. My dad is "John Smith V" and I think it actually ate at him that he wouldn't be able to give the world a "John Smith VI."
Well my dad and brother never really got along because my brother never wanted to play football, baseball or any of the other things that my dad thought "men" should do. My brother from the time he could turn on TV was fascinated with professional wrestling and it's been his passion ever since. Though he's not big enough to be in the ring, he works for a local wrestling promotion, does wrestling podcast, and even did an internship for a small WWE connected promotion and even met most members of the McMahon family encouraged him to go to school keep with the internships in order to work for them someday. My brother is a living example of someone recognizing their passions and making them happen.
My brother just turned 18 and decided that he's no longer going to be "John Smith VI" he's legally changing his name to "Typhoon Torturer" (it's not exactly that, but you get the idea). My parents are beside themselves, my dad especially. My younger sister got pregnant when she was 14 and I don't think they took that as hard as they are taking this name change.
Why I'm asking the question, I am the oldest sibling and it's always fallen on me to be the "peacekeeper" between my parents, siblings, dogs, cats, you name it. I can see both sides of this argument but what it comes down to is that I think my brother should be able to change his name and I don't think I'm actually neutral in this.
Should I try to talk to my parents (as I usually would) or should I finally just stay out of it and let them figure this out?

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tl;dr: My brother is planning on changing his name from "John Smith VI" to "Typhoon Terror." My parents (Mr and Mrs John Smith V) are coming unglued. Should I try to convince them that my brother is within his rights to do this or should I just stay out if it.

submitted by /u/PaleAssumption
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