This is the 1098th most frequent French word.
xavier
"Xavier" is a proper noun, used as a masculine given name in French.
In this sentence, 'Xavier' is used as a proper noun referring to the person's name.
Xavier est un excellent étudiant en mathématiques.
Xavier is an excellent mathematics student.
Here, 'Xavier' again serves as a proper noun indicating the name of the individual being referred to.
Je vais envoyer un message à Xavier pour lui demander de l'aide.
I will send a message to Xavier to ask for his help.
In this context, 'Xavier' is still a proper noun referring to the same individual, showing possession by lending a book.