From Tolkien Gateway
Vingilot by Lída Holubová

Rothinzil is the Adûnaic name for Vingilot, the ship in which Eärendil sailed to Valinor, and in which he later sailed the pathways of the sky. By extension, it was also used by the Númenóreans to refer to the brilliant Star of Eärendil in the sky.[1]


The name Rothinzil is an exact translation of the Elvish Vingilot ("Foam-flower"),[2] being the combination of roth ("foam") + inzil ("flower").

In some notes on Quenya phonetics, Tolkien seems to have considered the name as Quenya.[3]