Dealing with names in Japan is really a life experience in itself. Yes, I was refering to the Alien registration certificate.
As you say, there are so many to choose from. I changed 4 times during my stay (at the end I had my name twice in the same field, one in latin characters and one in katakana, plus a 'nickname' with my wife's family name. BTW it was the best choice so far, even if it's awkward to fill bank papers with 'SOME ROMAJI NAME (カタカナ名)'. Immigration Office staff really do a shitty job at dealing with the registration, but I had it changed at the prefecture I lived. They are much more forthcoming, and will accept to use anything reasonable as a name.
As you say, there are so many to choose from. I changed 4 times during my stay (at the end I had my name twice in the same field, one in latin characters and one in katakana, plus a 'nickname' with my wife's family name. BTW it was the best choice so far, even if it's awkward to fill bank papers with 'SOME ROMAJI NAME (カタカナ名)'. Immigration Office staff really do a shitty job at dealing with the registration, but I had it changed at the prefecture I lived. They are much more forthcoming, and will accept to use anything reasonable as a name.