The Spanish word 'querella', meaning 'complaint' or 'legal accusation', comes from the Latin word 'querella' meaning 'complaint'. This Latin noun was derived from the Latin verb 'queri' meaning 'to complain'. The word maintained both its form and its basic meaning as it evolved from Latin to Spanish, though in Spanish it has taken on a more specific legal connotation.

A related Spanish word that students might recognize is 'queja' (complaint), which, while taking a different form, also derives from the same Latin root of complaining. The verb 'quejarse' (to complain) is also commonly used in everyday Spanish.

While English doesn't have many common direct cognates from this Latin root, we do see it in the somewhat formal word 'querulous', meaning 'full of complaints' or 'whining'. The word 'quarrel', though it might seem related, actually comes from a different Latin root.