If I was trooning out for real I’d probably name myself Jack Patrick $currentSurname because that’s what my mom said she would’ve called me if I was a boy since she chose not to know what gender I was until I was actually born.
If I was an MtF choosing an entirely new attention seeking wacky name though... I think it would be Eowyn Journey Suzumiya.
Eowyn because of the whole “I AM NO MAN” bit in Lord of the Rings, Journey because it’s a special snowflake name I unironically like and could ~symbolise my transition~ or some shit and Suzumiya because Haruhi Suzumiya is kind of a Mary-Sue manic pixie dream girl and I felt like it needed something weeby.
Back during my 'considering troonism' phase I asked my friends to call me Jean. I was Jean Gracie (lastname) for about a year before I got my brain back.