A kinswoman of Húrin in Dor-lómin; taken as wife by Brodda the Easterling; aided Morwen after the Nirnaeth Arnoediad. 243, 264

Aerin, the daughter of Indor, was a woman of Dor-lómin, member of the House of Hador and closely related to Húrin Thalion.

After the Nirnaeth Arnoediad, Brodda the Easterling became the lord of Hithlum, and took her as his wife against her will, hoping thus to produce an heir. Aerin secretly helped Húrin's wife Morwen.

When Túrin, son of Húrin, returned to Dor-lómin, he learned from Aerin that his mother had left Hithlum. In rage he killed Brodda, thereby also sealing Aerin's fate, who burnt herself alive in her hall, and the remainder of the House of Hador now was persecuted even more cruelly.

The name incorporates aer ("ocean"). The ending perhaps is the same in the names of Húrin and Túrin; in that case the name would mean "She who desires the Sea".