Proper noun
An image of a man perceived in the dark maria and light highlands of the full moon. Now usually seen as a human face, in older traditions he is a man with a burden on his back, or accompanied by a small dog.
Synonym: moonman
(UK politics, slang, obsolete) A man who would pay for election expenditure and electors' expenses, as long as the latter voted his way.
Source: en.wiktionary.orgAnd the cat's in the cradle and the silver spoon, Little boy blue and the man in the moon. "When you coming home, dad?" "I don't know when, But we'll get together then. You know we'll have a good time then. Harry Chapin
I look like the man in the moon. Martin Freeman
The man in the moon stole the wood. German Proverb
William Joyce’s The Man in the Moon! Source: Internet