Louis Jolliet vs Louis Joliet

Louis Jolliet and Louis Joliet both are nouns.

Word	Noun	Adjective	Verb	Adverb
Louis Jolliet	Yes	No	No	No
Louis Joliet	Yes	No	No	No

As nouns, Louis Jolliet and Louis Joliet are synonyms defined as:

Louis Jolliet and Louis Joliet: French explorer (with Jacques Marquette) of the upper Mississippi River valley (1645-1700)

Other synonyms of Louis Jolliet include Joliet, Jolliet.

Louis Jolliet (noun)	Louis Joliet (noun)
French explorer (with Jacques Marquette) of the upper Mississippi River valley (1645-1700)	French explorer (with Jacques Marquette) of the upper Mississippi River valley (1645-1700)