12th king of Gondor (LotR/1038), his name seems to be a combination Q. tar- “king and queen (in compounds)” and S. annon “gate”, apparently a mixed-language name.
Quenya
Tarannon
high-gift
tarannon
masculine name. Tarannon
Elements
Word Gloss tar- “high, high; [ᴹQ.] king or queen (in compounds)” annon “(great) gate, door”
Tarannon masc. name; ?"High-gift"? Or, if -annon is a Sindarin-influenced form of andon "great gate" rather than a masculinized form of anna "gift", "Lord of the Gate"??? (Appendix A)