Greyhame
From Tolkien Gateway
Greyhame was one of Gandalf's many titles and surnames, used particularly in the country of Rohan. It was the equivalent in the tongue of the Rohirrim of 'Greymantle' or 'Greycloak'. According to some sources, the name is a rendering into ancient English of Incánus, the Westron name for Gandalf (though note that this is only one of several competing explanations of the old name Incánus).
