'agathodaemon' originates from Greek, specifically the word 'ἀγαθός' (agathos) meaning 'good' and 'δαίμων' (daimon) meaning 'spirit' or 'deity'.

'ἀγαθός' (agathos) and 'δαίμων' (daimon) combined in ancient Greek to form 'ἀγαθοδαίμων' (agathodaemon), which was later adopted into Latin as 'agathodaemon'.

Initially, it meant 'good spirit' in the context of Greek religion, and this meaning has largely remained the same in modern usage.