Bartleby: Steinitz, Pillsbury, and Smyslov have all employed the 3. ...g6 in the Ruy Lopez. I've heard this variation named after all three of them. It's a close cousin to the Cozio, where Black first plays 3. ... Nge7 before ...g6, as seen in these instances:
De Vere vs Steinitz, 1870
Blackburne vs Steinitz, 1873
Here is the ...g6 Ruy Lopez proper by its popularizer, the great Steinitz:
Mackenzie vs Steinitz, 1883
Winawer vs Steinitz, 1883
A couple fine wins by the American meteor Pillsbury, who trotted it out from time to time:
Showalter vs Pillsbury, 1893
Teichmann vs Pillsbury, 1895
And finally, modern treatment by Smyslov, in an era when the variation was thought to be dubious and wrong (lo, what a similar fate for so much which theoretically falls by the wayside):
Tal vs Smyslov, 1976
Kasparov vs Smyslov, 1975
Not bad, eh? Kramnik thought that Smyslov had one of the most "correct" styles in chess.
I'm a big fan of this line in the Ruy; leads to enterprising, asymmetrical chess.