This would sound stupid, but i guess the
gollum sound came about due to Gollum's excessive fish-eating (or any other meat, for that matter).
IN
The Hobbit :
Quote:
And when he said gollum he made a horrible swallowing noise in his throat. That is how he got his name, though he always called himself "my precious."
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So I agree with Imladris that it is not like the sound Gollum made in the movie. And what did he usually swallow? Fish!
Do I make sense?