Gene Kelly vs Kelly

Gene Kelly and Kelly both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gene Kelly	Yes	No	No	No
Kelly	Yes	No	No	No

As nouns, Gene Kelly and Kelly are synonyms defined as:

Gene Kelly and Kelly: United States dancer who performed in many musical films (1912-1996)

Other synonyms of Gene Kelly include Eugene Curran Kelly.

Gene Kelly (noun)	Kelly (noun)
United States dancer who performed in many musical films (1912-1996)	United States dancer who performed in many musical films (1912-1996)
	United States film actress who retired when she married into the royal family of Monaco (1928-1982)
	United States circus clown (1898-1979)