I actually used to keep a list of those name transformations.

David Ben Gurion used to be David Joseph Gruen

Moshe Sharett was Shertok.

Ariel Sharon was Scheinerman

Golda Meir was a Meyer

Menahem Begin was Wolfovitch

Shimon Peres was Szymon Perski

It seems the only prime minister who didn't have a fake name was Rabin, so they killed him.