Morphy defense 3...a6 (5 games)
Berlin defense 3...Nf6 (2 games)
Never forget 8.h3
Meanwhile, 8. c3 is the most popular, leading to the Marshall attack.
One more Closed Ruy Lopez game:
https://www.chess.com/events/2021-candidates-chess-tournament/10/Caruana_Fabiano-Ding_Liren
featuring the anti-Marshall variation.
Let's analyse a bit recent top-GM Ruy Lopez games:
https://www.chess.com/events/2021-candidates-chess-tournament/01/Vachier_Lagrave_Maxime-Caruana_Fabiano
https://www.chess.com/events/2021-candidates-chess-tournament/02/Vachier_Lagrave_Maxime-Ding_Liren
https://www.chess.com/events/2021-candidates-chess-tournament/02/Nepomniachtchi_Ian-Grischuk_Alexander
https://www.chess.com/events/2021-candidates-chess-tournament/04/Vachier_Lagrave_Maxime-Grischuk_Alexander
https://www.chess.com/events/2021-candidates-chess-tournament/05/Grischuk_Alexander-Ding_Liren
https://www.chess.com/events/2021-candidates-chess-tournament/06/Grischuk_Alexander-Caruana_Fabiano
https://www.chess.com/events/2021-candidates-chess-tournament/06/Nepomniachtchi_Ian-Ding_Liren