If I recall correctly and I think that I am then Pain is a descendant of the Fuuma Clan. A clan that came to light in the FILLERS. They used special Chakra attacks. Its in the first Filler Arc. They learn about the clan in "Town of outlaws Shadow of the Fūma clan"

But since thats with one U and not 2 I could be wrong about the clan. However it would be cool if they used a clan from the fillers and intigrated it into the manga.