While the exact origin of the word is debated, it's generally believed to be derived from the Wiradjuri word "boomerang" or "bumerang", which refers to the curved throwing stick itself.
It's important to note that the word "boomerang" is a specific term for the curved throwing stick that returns to the thrower. The Wiradjuri language has different words for other types of throwing sticks, like the "womera", used to launch spears.