'anarch' originates from Greek, specifically the word 'anarkhos', where 'an-' meant 'without' and 'arkhos' meant 'ruler'.

'anarkhos' transformed into the Medieval Latin word 'anarchus', and eventually became the modern English word 'anarch' through Middle English.

Initially, it meant 'without a ruler', but over time it evolved into its current meaning of 'a person who promotes anarchy or rejects authority'.