King Thorin's sister's name

[Raynor]

Perhaps this would be of interest:

Originally Posted by Durin's Folk, HoME XII

Finally, there is a note on the absence of record concerning the women of the Dwarves:

They are seldom named in genealogies. They join their husbands' families. But if a son is seen to be 110 or so years younger than his father, this usually indicates an elder daughter. Thorin's sister Dis is named simply because of the gallant death of her sons Fili and Kili in defence of Thorin II. The sentiment of affection for sister's children was strong among all peoples of the Third Age, but less so among Dwarves than Men or Elves among whom it was strongest.