Quenya was an Elvish language, but Elves weren't the only race to learn it. In The Lord of the Rings, Tolkien tells of how many Númenóreans learned Quenya through their friendship with the ...

Quenya, which Tolkien describes as a sort of “Elf Latin,” is mostly reserved for names, formal phrases, and poetry — Gil-galad’s song in the season 2 premiere, ...

Annatar was Quenya for "Lord of Gifts." It seems Sauron had to be Lord of Something, and since he no longer had the Isle of Werewolves, he chose to be Lord of Gifts in the Second Age.