Barakûl

In the Fourth Age the Barakûl were one of the two remaining dwarven-factions of the Westlands.The Barakûl were thought to have ben the secret heirs of a great, but forgotten, dwarven Kingdom in the mountains of the North, which halls they had sealed and whose original name was forbidden to mention, for it's treasures and knowledge the Barakûl had sworn to keep away from the immaturity and greed of Men.

Speculations
It is evident that the secret and sealed city refers to Moria and the Barakûl are the heirs of Durin's Dwarves.