This popular game is named after a 19th century American baker who baked pies in light circular metal tins and when bored, he threw the empty tins around for fun. Still, he did not know at the time that his name will be used for the new sport.
SKY Paragliders frisbee does not look like the tin any more, but when parawaiting, well, it could be used in the same way as the American baker had done almost 200 years ago.