Definitely not an upmarket name for a poacher. Gamekeepers would be employed by the owner of a big house or estate to breed and protect game from poachers. Here in Scotland it could also include stalking deer and caring for the River. In other words he was the professional on hand to help the owner and his guests when they wanted to go shooting or fishing. . Incidentally here in Thurso the college run degree courses in Gamekeeping. Ted