Éomer was the son of Éomund, who in turn was the nephew of Théoden, King of Rohan in J.R.R. Tolkien's Lord of the Rings. Théoden's son, Théodred, died young, making Éomer the heir to the throne of Rohan. His cavalry killed the orcs that had captured Merry and Pippin. He was imprisoned by Wormtongue for allowing Aragorn and his companions go free. When Gandalf restored Théoden, Éomer was released. He fought in the Battle of the Hornburg and the Battle of the Pelennor Fields. He became king when Théoden was killed in the latter battle. He was known as Éomer Éadig, or "the Blessed" because of the prosperity of Rohan during his reign.
Eomer was a legendary King of the Angles. He appears in genealogy of the Anglo-Saxon Chronicle, and in Beowulf. The name means "Horse-famous". The name does not appear in the Social Security Administration's name database.