If I point to the overwhelming support of Pahlavi by Iranians in the diaspora, you'll point out that opinion within Iran itself could be completely different... and you'll be correct.

If I point to a poll from within Iran, you'll say it's unreliable... and again you'll be correct.

If I point to the numerous videos from the protests featuring 'Javid Shah' chants, you'll say we can't know if they are representative... and yet again you'll be correct.

So I don't have a good source, and I don't know for certain. It's just my impression.