Gollum is a monster with a distinctive style of speech in J. R. R. Tolkien's fantasy world of Middle-earth. He was introduced in the 1937 fantasy novel The Hobbit, and became important in its sequel, The Lord of the Rings. Gollum was a Stoor Hobbit of the River-folk who lived near the Gladden Fields. In The Lord of the Rings, it is stated that he was originally known as Sméagol, corrupted by the One Ring, and later named Gollum after his habit of making "a horrible swallowing noise in his throat". Sméagol obtained the Ring by murdering his relative Déagol, who found it in the River Anduin.
https://en.wikipedia.org/wiki/Gollum