Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!

Qenya 

elendil

masculine name. Elf-friend

Qenya [Ety/NIL; LR/029; LR/031; LR/048; LRI/Elendil; RS/197; RS/215; RSI/Elendil; RSI/Orendil; SD/403; SDI1/Elendil; SDI2/Elendil; SDI2/Nimruzân; SDI2/Nimruzîr; TII/Elendil; WRI/Elendil] Group: Eldamo. Published by

elendilion

proper name. Descendant of Elendil

Apparently a name for the kings of Gondor as descendants of Elendil in Lord of the Rings drafts from the 1940s, appearing in its Anglicanized plural “Elendilions” (WR/76). It is a compound of the name Elendil and the patronymic suffix -ion.

Qenya [WRI/Elendilion] Group: Eldamo. Published by

elendilli

collective name. Elf-friends

Qenya [PMI/Elendili; SD/403; SDI2/Elendili] Group: Eldamo. Published by

elesser

masculine name. Elf-friend

A variant of Elendil appearing in The Etymologies from the 1930s (Ety/SER), perhaps a compound of the root ᴹ√ELED “star-folk, Elf” and the suffix -ser “friend”, as indicated by the archaic form †Eleðser.