I am interested in changing my roman name on my passport from mandarin pronunciation to Taiwanese (Min Nan) pronunciation. For example, Bruce Lee’s name is 李振藩 transliterated as Lǐ Zhènfān in Mandarin, but in Taiwanese it would be Li Tin phuan. Anyone have any idea how difficult or easy this may be?
Only the Ministry of Foreign Affairs can change your name. You would need a new passport. As you have already been using a romanized version of your name they may not be willing to change it.
I was careful to give them the romanized spelling I wanted for my Chinese name in my passport.
What country’s passport is it? If the USA, then you would have to show proof of name change…which is, I think, impossible outside of the USA.
Overseas ROC passport