The English surname Trout, also found as the variant spelling Troutt, is derived from the Middle English term trowte ‘trout’, hence a metonymic occupational name for a fisherman, or a nickname for someone supposedly resembling the fish. The first known recording is probably that of William Trute in the Assize Rolls of the county of Lancashire in the year 1202, and later William Troute in the Subsidy Tax rolls of the county of Suffolk in 1327. Other interesting recordings are those of Thomas Trout of Yorkshire in the Poll Tax register of 1379. Today there are over 13,000 people living in the United States with the last name Trout and 2,000 with the last name Troutt.
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