Michel Montaigne vs Michel de Montaigne

Michel Montaigne and Michel de Montaigne both are nouns.

Word	Noun	Adjective	Verb	Adverb
Michel Montaigne	Yes	No	No	No
Michel de Montaigne	Yes	No	No	No

As nouns, Michel Montaigne and Michel de Montaigne are synonyms defined as:

Michel Montaigne and Michel de Montaigne: French writer regarded as the originator of the modern essay (1533-1592)

Other synonyms of Michel Montaigne include Michel Eyquem Montaigne, Montaigne.

Michel Montaigne (noun)	Michel de Montaigne (noun)
French writer regarded as the originator of the modern essay (1533-1592)	French writer regarded as the originator of the modern essay (1533-1592)