Yes, GIBSON is a Scrabble word!

Letter values in Scrabble US: G 2, I 1, B 3, S 1, O 1, N 1.

Is it a valid word?

GIBSON is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

United States illustrator remembered for his creation of the `Gibson girl' (1867-1944)
Australian actor (born in the United States in 1956)
United States tennis player who was the first Black woman player to win all the major world singles titles (1927-2003)

Also: c. d. gibson, charles dana gibson, mel gibson, mel columcille gerard gibson, althea gibson.