The Spanish word 'polo' has two distinct etymological origins depending on its meaning. When used to mean 'pole' or 'axis', it comes from the Latin word 'polus' (meaning 'pole, axis'), which itself derives from the Ancient Greek 'pólos' (πόλος) meaning 'axis' or 'pivot'.

However, when referring to the sport or the type of shirt, 'polo' comes from a completely different source. This meaning entered Spanish through English 'polo', which ultimately comes from the Tibetan word 'pholo' meaning 'ball'. The sport originated in the Indian subcontinent and was later popularized by British colonials.

The Spanish word 'polar' (polar) is related to the 'pole/axis' meaning of 'polo'. Similarly, words like 'polarizar' (to polarize) and 'polaridad' (polarity) share this same root.

English speakers might recognize the connection to words like 'pole', 'polar', and 'polarity', which share the Greek-Latin etymology of the 'axis' meaning of 'polo'. Of course, English also has the word 'polo' itself, both for the sport and the style of shirt, which shares the Tibetan-derived etymology of the Spanish sporting term.