A barrel maker or trader
Couper is a variant of the English occupational surname Cooper. It historically refers to a person who made and repaired wooden casks, barrels, and tubs, or alternatively, a merchant or trader in Middle English.
Less common today
Couper isn't in the latest US Top 1000. It last peaked at #5,444 in 2010.
A character in the video game series Β· Animal Crossing
US births per 5-year period, 1990βpresent (SSA data).