I get the sense you might be asking about a specific book titled 'Moon', but the tricky part is that there isn't a single universally-known novel just called 'Moon' — lots of creators have used that simple, evocative title. When I hunt for a book like this, I look for extra clues: a line you remember, the cover color, a character name, or even the year you read it.
If you want a general take on what inspires books titled 'Moon', I can tell you from reading and chatting with writers: the moon is an irresistible symbol. Authors often pull from lunar myths, personal loneliness, colonial or corporate sci-fi ideas about celestial mining, werewolf folklore, or even romantic longing. Sometimes it’s literally inspired by space exploration and scientific curiosity; sometimes it’s a metaphor for grief, cycles, and secrets. If you can drop one small detail — even a phrase — I’ll chase down the exact author for you, and we can dig into their specific inspiration.