What are the three most used Sicilian Variations?

Isn't it the Najdorf, Open and the Dragon?

yes it is Najdorf, Open and the Dragon.There alos migth be acceleratod and hyperaccelratoed tragon

Check chess.com or lichess database.

Taimanov be like:

Well, hyper and accelerated dragons are still dragons so I don't think it makes any difference.

The Najdorf variation is inside the Open so one of the can't count.

Najdorf, dragon and closed.
also Alapin and smith morra gambit

the dragon, open, and alapin