Eldest son of Isildur (S/295, UT/271) and also the 9th king of Arnor (LotR/1038). This name is probably a compound elen “star” and the suffix -(n)dur “-servant”.
Quenya
Elendur
star-servant
elendur
masculine name. *Star-servant
Elements
Word Gloss elen “star” -(n)dur “servant; to serve”
Elendur masc. name, "Star-servant", probably intended to mean "Elf-servant"; in effect a variant of Elendil(Appendix A). The name was also used in Númenor (UT:210).