Truly, it depends upon where YOU decide to go with it all. As I see it, you can remain male which would require you do nothing. You can chose to be simply tg, which you may or may not want to change your name. You can chose to be ts pre-op which you would present as female so a name change is probably in order. You can chose to be ts post-op in which case you would definitely want to change your name. The thing is, it is up to YOU to define.