Felarof was the name of the horse that Eorl rode from the north. He was the forefather of Shadowfax. That line of horses was called the mearas.

The horse that carried Eowyn and Merry from Rohan to Gondor was Windfola.

The Grey Wanderer was a common name for Gandalf, a translation of Mithrandir, which is what the elves and the men of Gondor called him. Tharkun was his name among the dwarves, Stormcrow in Rohan, Olorin in Valinor. I think Incanus was what he was called by the Southrons, but I'm not sure.

John Peekstok