The seven rings were given to the dwarves of seven clans: Longbeards, Firebeards, Broadbeams, Ironfists, Stiffbeards, Blacklocks, Stonefoots. What were the names of the rings given to them?
No names are given for either the Nine or the Seven
Throughout the Lord of the Rings and other related material (including the essay Of the Rings of Power and the Third Age in the Silmarillion) only the Three Elven rings are given names.
In Of the Rings of Power and the Third Age the fact that the Three were different to the others is specifically called out:
Now these were the Three that had last been made, and they possessed the greatest powers. Narya, Nenya, and Vilya, they were named, the Rings of Fire, and of Water, and of Air, set with ruby and adamant and sapphire; and of all the Elven-rings Sauron most desired to possess them, for those who had them in their keeping could ward off the decays of time and postpone the weariness of the world. But Sauron could not discover them, for they were given into the hands of the Wise, who concealed them and never again used them openly while Sauron kept the Ruling Ring. Therefore the Three remained unsullied, for they were forged by Celebrimbor alone, and the hand of Sauron had never touched them; yet they also were subject to the One.
In fact these Three were also the only rings that the Elves saved from Sauron; he had successfully captured all of the others, and those captured rings were the ones he gave to the other races:
But Sauron gathered into his hands all the remaining Rings of Power; and he dealt them out to the other peoples of Middle-earth, hoping thus to bring under his sway all those that desired secret power beyond the measure of their kind. Seven Rings he gave to the Dwarves; but to Men he gave nine, for Men proved in this matter as in others the readiest to his will.
The only indication of anything that may be a name used for any of the Dwarf rings is given at the Council of Elrond:
The Seven are lost to us – if Balin has not found the ring of Thrór which was the last; naught has been heard of it since Thrór perished in Moria.
But "ring of Thrór" could not possibly be it's original name because it was given to the Dwarves in the Second Age, millennia before Thrór lived.
- No names are given for any rings other than the Three.
- There is no reason to believe that any other rings had names.
- While they certainly could have done so, the fact that the Three are special and different is constantly called out.
- Dwarf rings may simply be named for the current (or last-known) holder, e.g "ring of Thrór" (remember that only Gandalf knew that Thrór had given his ring to his son).