Billabong International Limited is primarily a clothing company that also produces accessories and skateboard products under other brand-names. Founded in 1973 by Gordon and Rena Merchant, the company first traded on the Australian Securities Exchange on 11 August 2000. The name 'billabong' is derived from the Wiradjuri word 'bilaba?' that refers to a 'creek that runs only during the rainy season'. Von Zipper, Nixon, West 49 and Element are some of the prominent brands that Billabong owns.