From WordNet (r) 3.0 (2006) [wn]:
surfer
n 1: someone who engages in surfboarding [syn: surfer,
surfboarder]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Surfer \Surf"er\, n. (Zool.)
The surf duck. [U. S.]
[1913 Webster]