From Dutch boomken (“shrub, little tree”), equivalent to boom + -kin. Note that the English word boom is etymologically related to the aforementioned in the sense of "large stem", or "big tree". Compare German Baumke, Bäumchen.
bumpkin (plural bumpkins)
- A clumsy, unsophisticated person; a yokel.
- (nautical) A short boom or spar used to extend a sail or secure a stay.