Because that's the name Col. Potter chose for her, since she's a mare.
Colonel Potter's horse's name was Sophie.
Sophie
Col. Sherman T. Potter played by Harry Morgan
Harry Morgan
Trapper's orders simply came through. He left without Hawkeye's knowledge because Hawkeye was in Tokyo on R&R. Hawkeye tried to track him down, but his aeroplane left Kempo airfield about twenty minutes before Hawkeye arrived.
He was only portrayed by Harry Morgan.
McLean Stevenson
Sophie when Hawkeye, B.J and Radar found her in a feild where she was hurt.
Col. Hawkeye Pierce is supposedly from som cove in Maine and i bet one of the writers had a thing for Maine if penobscot came up. penobscot is an Indian tribe, a river and a county
so they could enter the water and leave no trail
so they could enter the water and leave no trail