My first comment was going to be "Rocks at the person who says lars". Ringo Starr is an even worse suggestion though, he wasn't even the best drummer in the beatles
Most the ones that leapt to mind are covered already. It's not often you get mega famous drummers so it tends to come down to a favourite band thing as usual
Still got a few suggestions outside of that though.
Vinny Appice (Sabbath/Dio/Heaven and Hell)
Mikky Dee (Motorhead)
Frankie Banali (Quiet Riot/W.A.S.P)
Tommy Lee (Motley Crue)
Mick Fleetwood (Fleetwood Mac)
Carl Palmer (Emerson Lake and Palmer)
Tommy Aldridge (Ozzy/Gary Moore/Whitesnake/Pat Travers)
Vinnie Paul (Pantera/Damageplan)
Simon Phillips (Priest/The Who/MSG...+ many moore)
Alex Van Halen (Van Halen)
Brian Downey (Thin Lizzy)
Nick Menza (Megadeth)
Rick Allen (Def Leppard)
Then for lesser suggestions:
Joey Kramer (Aerosmith)
Matt Sorum (Guns N Roses/Velvet Revolver)
Frank Beard (ZZ Top)