All of Tar-Meneldur's names were in Quenya. Meneldur means "Servant of the Heavens" (from Quenya menel "the Heavens" and -ndur "servant"); Írimon took this name because of his love for stargazing. Írimon itself means "Beautiful Man" (from írima "beautiful" and -on, a masculine suffix). Elentirmo is another name that referred to his interest in the Heavens; it signifies "Star Watcher" (from elen "star", tir "watch", and -mo, a masculine agentive suffix). Like all the rulers of Númenor who took their royal names in Quenya, Meneldur added the prefix tar- ("high") to his title when he received the Sceptre.
Quenya
meneldur
masculine name. *Servant of the Heavens
tar-meneldur
Tar-Meneldur
The Quenya name of the fifth king of Númenor, a compound of menel “the heavens” and -(n)dur “-servant”, that is: “✱Servant of the Heavens”. He adopted this name because of his love of star-lore (UT/219).