Rumor from WatchersOnTheWall.com says that the reported name "Keyr" for this character was ultimately changed to "Mossador" -- which is actually Missandei's brother's name. However those who saw the Season 5 premiere said that he exchanges lines with Missandei at one point, yet there was no indication that they are related (that and he doesn't really look like her...) -- leading to the suspicion that if this name change did occur, it might just be a case of the writers recycling names from the books, to at least give it an A Song of Ice and Fire feel instead of seeming out of place (you can't exactly call him "McSweeney").
We'll await confirmation on this.--The Dragon Demands (talk) 22:15, March 21, 2015 (UTC)