However, the most commonly cited languages are:
* R'lyehian: This is the language spoken by the Great Old Ones, including Cthulhu. It is described as a language of "horrible whispers and guttural sounds," and is considered the "true" language of the Necronomicon.
* Arabic: In some versions, the Necronomicon is written in Arabic, reflecting its supposed origins in the Middle East.
* Ancient Sumerian: Other versions claim the book is written in ancient Sumerian, tying it to the ancient Mesopotamian civilization and further emphasizing its age and power.
It's important to note that these are all fictional languages created by Lovecraft. There is no real-world basis for any of them. The Necronomicon itself is a fictional book, and any language attributed to it is purely for dramatic effect.