Mairen
From Tolkien Gateway
Mairen (born Second Age 377) was the third child and only daughter of Tar-Amandil, the third King of Númenor. Her eldest brother would take up the Sceptre as Tar-Elendil. Almost nothing is known of her life.
Mairen's name is difficult to translate, but may be Quenya for "Maiden of the Gulls" (from maiwë = "gull" and -wen = "maiden").
Genealogy
Tar-Amandil
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Tar-Elendil Eärendur MAIREN
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Kings of Númenor