The story
From quad- (“four”) + ball. The sport sense was introduced in 2022 by the International Quadball Association (IQA), formerly the International Quidditch Association, with quad- chosen in reference to the number of balls and positions in the game. The IQA cited concerns over the trademarked status of Quidditch and a wish to distance itself from the "anti-trans positions" of J. K. Rowling.
Etymology from Wiktionary, CC BY-SA 4.0.