There is a site of some people who have loads of cats all named after Middleearthcharacters 🙂 breeding Ragdolls, I think
http://www.ragdolls.it/abroad/Belgio.html
(and one has the same name as I usually have on the net 😍 )
There's probably a great deal of people who have named their pets after Tolkien's characters, but with children on the other hand, there really isn't a lot to choose from (unless you want to make you kids high school days a living hell). There are a few though:
Sam, Esmeralda, Linda, Lily, Rose (which quite frankly is a beautiful name), but the rest of them: Gorbadoc, Marmadas, Aragorn, Legolas, Gimli etc., are too horrible for any human child.