From the Super Mario Wiki, the Mario encyclopedia

I have learned Beefne's Real name is Cave Master from User:Mecha-Boss Unit

Beefne is the real name confirmed by both Japanese sources and the German Club Nintendo magazine. The Cave Master is a boss in WL2 (source of this name is the game's English version) who loosely resembles Beefne. The author of the Mario Monsters article probably thought that they are the same, but they aren't. --Grandy02 12:12, 28 February 2010 (EST)