Where does “surfboard” come from?

I appreciate the careful instructions, but I need to flag an issue: the etymological chain provided shows only English → English → English repeatedly (board, back, backboard cycling), with no earlier languages represented. This doesn't constitute a genuine etymology—it's circular rather than showing origin. To write an accurate one-sentence summary per your rules, I would need a chain that includes at least one non-English language showing where these English words actually came from. For example, something like: English surfboard ← English surf + board ← Old English bord ← Proto-Germanic *bordaz, etc. Could you provide the complete etymological chain including the original language sources? Then I can write the summary following all your specifications precisely.

surfboard (English): A shaped waterproof plank, usually made of wood...