The Spanish word 'cantinero' (meaning 'bartender') comes from combining 'cantina' (meaning 'bar' or 'canteen') with the occupational suffix '-ero'. The word 'cantina' itself entered Spanish from Italian, where it meant 'wine cellar' or 'canteen'. Going even further back, the Italian word derives from Latin 'canto' meaning 'corner' or 'edge' - likely referring to the corner or separate space where wine and drinks were stored in buildings.

A simpler related Spanish word is 'cantina', meaning 'bar' or 'canteen'. The suffix '-ero' is very common in Spanish for forming occupational terms, similar to how English uses '-er' (like in 'teacher' or 'worker'). So a 'cantinero' is literally someone who works in a 'cantina'.

The English word 'canteen' is related to 'cantinero', as both come from the same Italian root 'cantina'. While 'cantinero' specifically refers to a bartender, 'canteen' in English evolved to mean an eating establishment, especially one in a factory, school or military facility. The connection makes sense as both relate to places where drinks and food are served.