Raymanian

Raymanian is the language used in the Glades of Dreams. It seems to sound different with different species to fit their personbality, such as Ly's sounding like echoing, Murphy's sounding like whispers and Razorbeard's sounding like an angry robot. It was only used in Rayman 2/DS and you could choose it in Rayman Revolution. Also, the characters seem to speak it in Rayman M, Rayman Raving Rabbids and Rayman Raving Rabbids 2. It isn't used in Rayman 3: Hoodlum Havoc, so whether they do speak it in Rayman 3 in canon is not known.

The people (or at least Rayman) also seem to be able to speak English/French/German/etc. as at the end of Rayman Raving Rabbids 2 (DS) Rayman is speaking to some humans.