Nope.
Its basically, Im not sure how to call it so lets just call the language "Eldritch"
Its a common phrase used by Cthulhu worshippers. IIRC it translates into something similar to "In his House in R'lyeh, Dead Cthulhu lies dreaming"
Lovecraft needs to make a whole entire language. loving Eragon, Ancient language stuff.
Also, the cult of cthulhu is real stuff. Cthulhu isn't. The cult is just a butch of crazy forgettards.
I mean, it's a fictional character from a fictional book.