Their name Röyksopp, derived from Norwegian "røyksopp", translates into English as "puffball" or "mushroom cloud". This type of mushroom is notable for the misty cloud created when it releases its spores.
There is also an obvious hallucinogenic double meaning to the name. Or perhaps a reference to the plume of smoke during an atomic explosion.
Also, "Eple" from the first album translates to English as Apple.