Sorry, Tolkien! Gollum IS of course your literary property, but if you explicitly state that he got that nickname because of the swallowing sound he repeatedly made, a philologist simply cannot afford to overlook him in a discussion about the supposedly proven Nostratic root M-L-Q. You were simply begging to have him intrude into such a discussion: I believe nobody who has read your book and then seen the list of supposed reflexes of Nostratic M-L-Q, of which an Amerindian one was nearly Gollum (OK, there was a vowel before the g or other velar!) and where most meanings are either throat or swallow (other ones being drink, suckle, milk [a cow or goat] and Germanic also milk [in a bowl]), can overlook the fact that Gollum or other permutations of G-L-M, M-L-G are about as good evidence for a common origin of these words and languages as a list of languages in which the word for cat sounded like meeow!
In case you have no idea of what theory I am talking about, Mark Rosenfelder has given another refutation of it, along with a citation of its content here.
My argument is that the combinations of MMMMM and GLGLGL are onomatopoetic.
Update, Epiphany Octave of 2013:
Two more onomatopoetic words in Merritt Ruhlen's list:
Aqua for water sounds exactly like - smoothness - splash - resumed smoothness. The qu in itself sounds very much also like the gl of milk and gollum. Qu? Gl? Klooklooklooklook ... (and a few languages aqua means to drink).
Tik for "one" or "finger" sounds very much like the snapping of fingers.
So, again, sound and meaning similarity does not prove common origin here either. Confer how "maman" and "papa" have made it from French to so many other languages of Europe because they have all the air of being onomatopoeia./HGL