Polo Shirt before the advent of tennis is dressed in traditional shirts, stockings and tie. Later introduced by Polo Ralph Lauren-style is popular, and whereby this clothes-introduction to Polo and other sports and leisure wear, therefore it is called the Polo shirts, also known as the golf shirts (golf shirt).
And most often a misunderstanding by expounding on the literal meaning. Misinterpretation is a former version of the following:
Polo is an English Aristocrat advanced Polo and Polo shirts were originally noble Polo clothing worn by the time, perhaps because comfort, they like to wear collar short sleeves, over time have been called "Polo Shirt" (polo shirt) and then widely popular, so evolved into general casual wear.