Quick answer
Idril is a girl name meaning "sparkle brilliance".
Meaning and history
The name means "sparkle brilliance" in the fictional language Sindarin. In the Silmarillion (1977) by J. R. R. Tolkien, Idril was the daughter of Turgon, the king of Gondolin. She escaped the destruction of that place with her husband Tuor and sailed with him into the west.
Notes and context
Usage: literature