What is "valandil"

Valandil is a name used for two people in the Middle-earth legendarium of J. R. R. Tolkien:

• Valandil of Andúnië, founder of the line of the Lords of Andúnië in the western region of Andustar on the island of Númenor, from the Second Age
• Valandil of Arnor, High King of Arnor, from the early Third Age