In Vanilla P4, I used my name. Even after "Souji Seta" was introduced, I continued naming him after myself. I like "Yu Narukami", so I, and others use it. Simple as that. Same goes for P3, but I like "Minato Arisato", so I started using it.
Square Enix, create a sequel to TWEWY. You have 3 years. Fail and face erasure. - The Fanbase http://www.youtube.com/watch?v=fjf48W3Dg98
I never keep original names or in this case name MC after his Canon name. I named the MCs in FES and P4 after characters I use in a roleplay with a friend. With other games where you can rename characters(eg: FF9 since that's what I'm currently playing), I always name them after my own characters in my story. I just find it fun to imagine my own characters in the roles I put them in
Seeing as how the Golden Ending references the events of Arena and since in Arena he's Yu Narukami, I just don't see the point of naming him anything else.
For the same reason I would never name Tatsuya Suou anything else.
Otherwise I don't see the harm in people using the canon names, considering I just respond to the SOS messages to be nice and can't even remember any of the names that go with them because I'm busy doing something else on the game.
PSN: Neophoton (I pop up whenever, so I'll add you back whenever I do get on) Currently playing: Zone of the Enders HD, Persona 4 Golden