Mine isn't unique, as it's from The Legend of Zelda: Spirit Tracks. It was named after a town that was named Mayscore in the EU versions. However, I've never seen anyone else with another Mayscore, so it's very likely that I'm the only one using it.
I don't think there are any other Torettos, might be some more Woodburys though... Toretto comes from Fast & Furious movies & Woodbury came from The Walking Dead...
I think mine is pretty uncommon. I haven't checked the dream suite yet though. My town is named after the town in the game "Life Is Strange." It's called Arcadia Bay, but the dang 8 character limit >.<
EDIT: I take back everything I said. I just looked it up in the dream suite and I was duly proved wrong.
My town is named Blush? and I think it's pretty unusual, no other DA has the same name, with and without the accent. My town is very pink and magical so I think the name is fitting without being something boring and expected.
My new town name Leafton is quite uncommon. My new 2nd town named Pineside I'm not sure if its unique or uncommon. Haven't gotten the dream suite for both of them yet.
My town's name, Edolas, isn't that uncommon. I searched it in the Dream Suite a while ago and I got a good number of results. After all, the name originates from Fairy Tail and that series does have a lot of fans, so I wasn't surprised.
I haven't come across anyone else on here with this town name yet though.
I looked up Heaven in the dream suite and saw about 5-10 results, so I'd assume it's pretty uncommon.
I haven't looked up Moonview but I've only seen one or two.
My old towns name, Startown, seems pretty popular, a lot of results popped up when I looked it up via dream suite.
I haven't seen any Rosedawns.
My main, Groddle, is named after a region of the world of Ur, from the MMO Glitch. A tiny handful of Groddles comes up in a dreamsuite search. They're all former Glitch players and I know 'em all. Great minds think alike. <3 Saalatu is named after another region of Ur and I'm guessing there aren't any others out there with that name. There will definitely be towns named 'Earl' (mine's named after a cat [thank you, imaginative partner-in-crime]), but I haven't checked how many.