What name is given to someone who makes barrels?

Traditionally, a cooper is someone who makes wooden, staved vessels, bound together with hoops and possessing flat ends or heads. Examples of a cooper's work include casks, barrels, buckets, tubs, butter churns, hogsheads, firkins, tierces, rundlets, puncheons, pipes, tuns, butts, pins and breakers. Traditionally, a hooper was the man who fitted the metal hoops around the barrels or buckets that the cooper had made, essentially an assistant to the cooper.

The word is derived from Middle Dutch or Middle Low German kūper 'cooper' from kūpe 'cask', in turn from Latin cupa 'tun, barrel'. Everything a cooper produces is referred to collectively as cooperage. A cask is any piece of cooperage containing a bouge, bilge, or bulge in the middle of the container. A barrel is a type of cask.