bumpkin (n.)

"awkward country fellow," 1560s, probably from Middle Dutch bommekijn "little barrel," diminutive of boom "tree" (see beam (n.)). Apparently, though itself Dutch, it began as a derogatory reference to Dutch people as short and dumpy. The Dutch word came into English in a more literal sense in 1630s as nautical bumkin "short boom projecting from each quarter of a vessel."