What is the Sindarin name of the Grey Havens?

The Sindarin name of the Grey Havens is Mithlond.

Mithlond is the great Elven harbour on the Gulf of Lune in north-western Middle-earth. The name means “Grey Havens,” referring to the harbour’s grey appearance and its role as a place of departure. Círdan the Shipwright was its ruler and the master craftsman responsible for building the ships that carried Elves westward.

The Grey Havens became especially important near the end of the Third Age, when many Elves left Middle-earth for Valinor. Frodo Baggins, Bilbo Baggins, Gandalf, and several Elves departed from Mithlond at the end of The Lord of the Rings. It was not simply a trading port or military settlement: it was Middle-earth’s principal gateway to the Undying Lands.

Mithlond is sometimes confused with Lindon, the surrounding region west of the Blue Mountains. Harlond and Forlond were other harbours on the Gulf of Lune, but neither is the name of the Grey Havens themselves.