polo: [19] In Balti, a Tibetan language of northern Kashmir, polo means ‘ball’. English travellers in Kashmir in the 1840s observed a game being played on horseback which involved trying to knock a wooden polo into a goal using a longhandled mallet. The English sahibs lost no time in taking the game up themselves, and by 1871 it was being played back home in England, under the name ‘polo’.
polo (n.)
1872, Anglo-Indian polo, from Balti (Tibetan language of the Indus valley) polo "ball," related to Tibetan pulu "ball." An ancient game in south Asia, first played in England at Aldershot, 1871. Water polo is from 1876 (in early versions players sometimes paddled about on barrels or in canoes). Polo shirt (1892) originally was a kind worn by polo players.