My main island is called "Error," which is the name I've used for all of my main towns in the series since the original. The name was originally chosen as a joke (same as my character name) since I didn't actually expect to like the game as much as I did, and it kind of just became tradition to continue using the names for each game going forward. My secondary island's name is "Foxwell," which I got from the town name generator on QRCrossing for my second New Leaf town back when that site was still a thing.