From: Piotr Gasiorowski
> Old word. According to SAOB the Swedish word is from OSwHence also Finnish <korppi> (Korppi huus: "Ei milloinkaan"). To be sure,
> <korper>; ON has <korpr>. According to Cleasby & Vigfusson
> <korpr> is found in the Þulur (Snorra edda). It's also
> found as a nickname: <Ion korpr Rafns son> 13th c.,
> <Eysteinn korpr> at the end of the 12th c. SAOB agrees that
> it's onomatopoetic.