https://en.wikipedia.org/wiki/Daughters_of_Finw%C3%AB
Findis and Írimë (or Íriën) are fictional characters from J. R. R. Tolkien's Middle-earth legendarium, featured in The Peoples of Middle-earth. They were Elves, daughters of Finwë, king of the Noldor, and Indis; sisters of Fingolfin and Finarfin and half-sisters of Fëanor. Findis was the first child of Finwë and Indis, and Írimë was the third. Little is known about them except that Findis was "more like her mother" and that she stayed with Indis and Finarfin in Valinor, while Írimë went to Middle-earth with Fingolfin. Findis is a combination of her parents' names. Irimë's mother-name was Lalwendë or in shortened form Lalwen, and by this name she was generally known. This name was not changed in Beleriand because it already fit the style of Sindarin, though the true Sindarin form would have been Gladhwen.
Findis apparently still dwells in Aman. Írimë's fate is unknown, but she may have been slain or returned to Valinor after the War of Wrath. Neither appears in the published Silmarillion.
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