Palantir, Anduril, Istari, and there's even a home security one called Sauron, you can't make this shit up.
Back in my day, LotR names were used for cool metal bands like Gorgoroth, Amon Amarth, Cirith Ungol, Carach Angren, Burzum, etc.
There is band called Silmarils as well
the tolkien metal world continues: One of Nine put out a killer record on Profound Lore last year. https://oneofnine.bandcamp.com/album/dawn-of-the-iron-shadow (skip the first track if you don't care for "dungeon synth"). i'm not a big fan of keyboards in metal but the rest of the instrumentation is so good i can forgive it :)