The Spanish word 'maleficio' comes from the Latin word 'maleficium', meaning 'evil deed' or 'harm'. This Latin word was formed by combining three elements: 'male' meaning 'badly', 'facere' meaning 'to do or make', and the suffix '-ium' which indicates a result. So literally, 'maleficium' meant 'the result of doing badly' or 'an evil doing'. In Spanish, 'maleficio' specifically came to refer to an evil spell or harmful magic, though it can also refer to harm or damage more generally.

Several common Spanish words share roots with 'maleficio': 'malo' meaning 'bad' comes from the same Latin root 'male'. The verb 'hacer' (to do/make) comes from Latin 'facere'. You might also recognize these elements in words like 'malestar' (discomfort), 'malhechor' (wrongdoer), and 'maléfico' (evil, maleficent).

English speakers might recognize parts of 'maleficio' in words like 'maleficent' (harmful or evil in intent), 'malevolent' (having evil wishes), and 'malfeasance' (wrongdoing, especially by a public official). The 'male-' prefix appears in many English words indicating badness or wrong, while '-fic' (from 'facere') appears in words like 'beneficial', 'magnificent', and 'scientific', all relating to making or doing something.