Raymanian
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Raymanian is the language used by the intelligent species of the Glade of Dreams. It was first identified in Rayman 2: Revolution, where it can be chosen amongst other languages.
It seems to sound different with different species to fit their personality, 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 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 though.
It is possible that the characters are speaking Raymanian in Rayman; Mr Dark's laugh is subtitled with the words "You're doomed, Rayman", and Betilla's indistinct murmurings are also subtitled with various sentences.
In many locations throughout the Rayman series, strange letter-like engravings can be seen on the walls. These include the inside walls of the final level of Mr Dark's Dare in Rayman, the door to the Sanctuary of Water and Ice in Rayman 2, the doors in the Lava Sanctuary in Rayman Revolution, and the walls of the tunnels in the Desert of the Knaaren in Rayman 3. These engravings look curiously similar; as such, it has been speculated that they are Raymanian text.
Rayman also seems to be able to speak English, French, German, etc., as at the end of the DS version of Rayman Raving Rabbids 2 he is speaking to some humans.