Cayn
From A Wiki of Ice and Fire
Cayn is a Winterfell guard. He has a son, Calon.
In AGOT
When he leaves for King's Landing, lord Eddard Stark chooses him as a member of his personal guard. After the death of the king Robert Baratheon, during the arrest of lord Eddard in the throne room, he is killed by Sandor Clegane.