Louis Joliet vs Louis Jolliet

Louis Joliet and Louis Jolliet both are nouns.

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

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

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

Other synonyms of Louis Joliet include Joliet, Jolliet.

Louis Joliet (noun)	Louis Jolliet (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)