Yes, PAHLAVIS is a Scrabble word!

Letter values in Scrabble US: P 3, A 1, H 4, L 1, A 1, V 4, I 1, S 1.

Is it a valid word?

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

Shah of Iran who was deposed in 1979 by Islamic fundamentalists (1919-1980)
the Iranian language of the Zoroastrian literature of the 3rd to 10th centuries
the script (derived from the Aramaic alphabet) used to write the Pahlavi language

Also: mohammed reza pahlavi, shah pahlavi, mohammed reza pahlevi.

Not playable in Scrabble US: PAHLEVI, PEHLEVI.