Yes, HOYLES is a Scrabble word!

Letter values in Scrabble US: H 4, O 1, Y 4, L 1, E 1, S 1.

Is it a valid word?

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

an English astrophysicist and advocate of the steady state theory of cosmology; described processes of nucleosynthesis inside stars (1915-2001)
English writer on card games (1672-1769)

Also: fred hoyle, sir fred hoyle, edmond hoyle.