'aristo' originates from Greek, specifically the word 'aristos', where the root meant 'best' or 'excellent'.

'aristo' developed via New Latin and Middle French influences from Greek 'aristos' (ἄριστος) into words like 'aristocrat' in English, and was later used colloquially as a shortened form 'aristo'.

Initially, the root meant 'best' (i.e., the highest or most excellent); over time it came to label a social class ('member of the nobility') and then a colloquial short form ('aristo').