動詞のSwoopから名付けられてます：(空から舞い降りて)飛びかかる、 襲う、(…を)急襲する。いやー、めちゃめちゃカッコ良いネーミング。
下記はオフィシャルの説明。
The Swoopa developed out of trying to get more paddling into a typical pointy nose short board like our Pocket Rocket. By making the nose slightly wider, we were able to accomplish just that. Of course, anytime the nose area is increased some of the vertical performance ability is compromised but this is always the trade off to get addition paddling. On the Swoopa, however, one will notice the better paddling before any lack of performance. This is a fun, easy riding board with some legs to take it bigger and further than one might expect.