This is the 3636th most frequent French word.
manon
"Manon" is a French given name, typically a diminutive of "Marie."
Here, 'Manon' is used as a proper noun, being a first name of the subject in the sentence.
Manon danse gracieusement dans le salon.
Manon dances gracefully in the living room.
In this context, 'Manon' refers to a title of an opera or song, not a personal name.
La chanson 'Manon' est très populaire parmi les amateurs d'opéra.
The song 'Manon' is very popular among opera enthusiasts.
The usage of 'Manon' here is part of the title of a literary work, 'Manon Lescaut'.