A LOTR character: Imrahil
A character from The Hobbit: Ironfoot (Dain)
A character from Middle-Earth: Ioreth
A place in Middle-Earth: Imladris
Things from LOTR: Ithildin
A Silmarillion character: Irmo
Another Barrow Downer: Inziladun
Actor from LOTR movies: Ian McKellen
Beasts/Monsters.... uh... icky spiders? Irritating orcs?