The Spanish verb 'sobrar' comes from the Latin verb 'superare', meaning 'to rise above' or 'to surpass'. This Latin verb was formed by combining the prefix 'super-' (meaning 'over, above') with the verbal suffix '-are'. Over time, as Latin evolved into Spanish, 'superare' underwent phonetic changes to become 'sobrar', while maintaining its basic meaning of exceeding or going beyond, though it specifically came to mean 'to be left over' or 'to be in excess' in Spanish.

Several common Spanish words share this Latin root 'super-', including 'sobre' (meaning 'over' or 'on top of'), 'sobrepasar' (to exceed or surpass), and 'sobrante' (surplus or leftover). You can see how all these words maintain the core concept of 'over' or 'excess' from their Latin ancestor.

English speakers can easily connect 'sobrar' to many familiar words that come from the same Latin root 'super-', such as 'super', 'superior', 'supreme', and 'superb'. All these words carry the notion of being 'above' or 'beyond' the normal level. The English word 'surplus', meaning an excess amount, is particularly close in meaning to 'sobrar', though they developed through different paths from the same Latin concept of 'going above'.