The Spanish word 'sopa' (meaning 'soup') comes from the Proto-Germanic word '*suppa', which meant 'bread soaked in liquid'. This reflects the ancient practice of soaking bread in broth or liquid, which was a common way of eating in medieval times. Over time, the meaning shifted to focus more on the liquid portion of the dish rather than the bread, giving us the modern meaning of 'soup'.

Some related Spanish words include 'sopear' (to dip bread in sauce or liquid) and 'sopón' (a thick soup), which maintain clear connections to the original meaning of bread being soaked in liquid.

The English word 'soup' is actually a cousin of Spanish 'sopa', as they both derive from the same Proto-Germanic root '*suppa'. English also has related words like 'sop' (meaning to soak up liquid) and 'supper' (originally referring to the evening meal where people would sop up broth with bread), showing how this ancient food preparation method influenced multiple languages.