Rock or Numuhukumakiaki'aialunamor is a character from the series The Stormlight Archive.
Rock is a member of Bridge Four, and the first man to follow Kaladin, after Kaladin takes his place at the front of a bridge run.
His full name is Numuhukumakiaki'aialunamor, but since no one can pronounce it, he goes by Rock. His name is apparently a poem about a rock his father found before he was born.
He ended up on the Shattered Plains because his nuatoma (leader) challenged Sadeas for his Shardplate. His nuatoma lost, and his household, of which Rock was the cook, was given to Sadeas. Rock became a bridgeman because he cooked chull dung into all of Sadeas's food.
Rock is unusual in that he is able to see Syl without her specifically wanting him to see her, when asked he simply said it's an ability he was born with.