  Plaza is Spanish for a public square in a city or town. The word originally came from the Latin of the people in Spain.That popular word was plattia. And it traced back … to the original, more literary Latin word of plateia for courtyard.xists and is an alternate of. Merge this question into. Split and merge into it. Answer by Ntembu. Confidence votes 36.1K. The word 'plaza' is Spanish meaning a square or a place. A similar Latin word 'plattia' means courtyard.