Mine was LionTown in Animal Crossing Wild World and I was like 7 and I loved lions so I named it LionTown. You can still tell I love lions as Elvis is one of my dreamies. He's been my Animal Crossing bestie since I was 7 (I'm 16 now).
My first ever town (on ACCF) was shared with my kid brother, and he named it Gai Land (like the character from Naruto) lol.
I can't remember what my first real town's name was. I know my first ACNL one was Kirkwall.
My first town name was FishBerg for the Animal Crossing installment on GameCube. I was about six years old at the time I believe? I wanted my town to be notorious for all the fish I would catch.
My first town was back in AC GC and it was "china" because I also thought that by "city" it meant for me to give an actual location. I'm not entirely sure why I picked China over where I actually live though..
My first game was the GameCube game and my older sister decided to name our town C.A. Like the abbreviation for California, but with periods. I'm really not sure why that was the name she chose, but we were pretty young at the time.