I probably will this time, since it has stuck with me after watching the anime. Whenever I have the choice to name a guy in a game, I always go with the guyish version of my name.. Cory (My name is Courtney). I know it sucks, but if I actually put effort into naming a character, I would be there for hours.
I usually keep the last name "canon" and use something else for the first name.
ie I named the P3 protagonist Tempo Arisato.
I did the exact opposite when I started up the male protagonist side of P3P (and a replay of Fes). After a couple playthroughs of both Devil Survivor and Overclocked, it suddenly came to me that the P3MC and Haru use the same backstory, and from that point on, I have been unable to see them as anything but siblings in my own personal fanon, and thus Minato Harusawa was born. One of the few times I've changed the name I'd been using prior.
...Arena threw a wrench into the expanded theory that has Naoto as their sister. It's not completely dead, but unless Minato and Naoto either weren't in contact for that year or the Kirijo name never came up when they did speak (and both situations require her from being barred from investigating), it's not looking good.