Do you know your final fantasy?

[abrojtm]

I don't know how to help you find him but . . .
1. finding out his name isn't anything special, as it is neither recorded nor does it get you a special item

You do get the S. Rank Medal from the TH Guild.

As for your FFV question, you can get the final shard way way later in the game. Go back to Warus Tower with your submarine once you have it.