Idril was that most fair daughter of the king of Gondolin whom Tuor loved when she was a little maid, and who bare him Eärendel. Her the elves name Irildë; and we speak of as Idril Tal Celeb or Idril of the Silver Feet, but they Irildë Taltelepta.
“The Fall of Gondolin” - The Book of Lost Tales (part. 2) - HoME - J.R.R. Tolkien