@Steel Crescent
Well, according to the mlp wikia his name is Mane Moon (based on the toys), whereas the official closed captions for Rainbow Falls refer to him as Crescent Moon and the Gameloft game calls him Crescent Pony. So one of those three would be his canon name.
Derpibooru seems to link Crescent Pony and Mane Moon.
Alright
Well, according to the mlp wikia his name is Mane Moon (based on the toys), whereas the official closed captions for Rainbow Falls refer to him as Crescent Moon and the Gameloft game calls him Crescent Pony. So one of those three would be his canon name.
Derpibooru seems to link Crescent Pony and Mane Moon.