Eärendur was a Númenorean noblemen of the royal House of Elros.
He was the younger son of Tar-Amandil, the third King of Númenor. He had a son Caliondo, who in turn had a son, Malantur. Malantur was apparently a possible heir to Tar-Aldarion, his cousin, but the law was changed so Aldarion's daughter Ancalimë would be the heir.
Eärendur is Quenyan name that means 'Servant of the Sea'.