Elanor

Elanor is from Quenya, not Sindarin, but the meaning is correct.

Elanor is a compound of the prefix "El", star, and "Anor", sun in Sindarin. Many Elvish names have "El" (star) as part of the name. The words Elf, Elves, Elvish etc are presumably derived from Tolkien's romantic notion that El meant "star" because Elves are beings of the evening starlight. The names Elrond (star-vault) and Elbereth (star-kindler) are other names for Elves. Anyone can make new Elvish names by combining similar words. For example, El (star) could be combined with Mir (jewel), Elmir, to form a name that Tolkien did not actually create. Tolkien gave the name elanor to a flower that grows on Cerin Amroth in Lothlorien. When Samwise Gamgee was pondering the name to give his first child, Frodo reminded him that Hobbits name their girls after flowers. Frodo recalled the beautiful flowers of elanor that they saw in Lothlorien, a place that Sauron's mind never apprehended. Sam's daughter Elanor later became maid of honor to Queen Arwen. She kept the red book after Sam left Middle Earth and sailed for Valinor. J R R Tolkien translated the red book from its native Westron into modern English and named it The Lord of the Rings. Following the death of the king, Arwen laid upon Cerin Amroth and there her grave remains until elanor and niphredil bloom no more East of the Sea.

It can also be a variant of Eleanor.

As well as being a flower in "The Lord of the Rings", Elanor is the name of the eldest daughter of one of the main characters, Samwise Gamgee. He named her after the flower at Frodo Baggins' suggestion, continuing a flower name tradition in the family of his wife, Rosie.