From Frankish *bannjan (to proclaim) — originally the formal proclamation of exile; kin to 'ban,' 'bandit,' 'abandon,' and 'contraband.'
To send someone away from a place as an official punishment; to drive away or get rid of something.
From Old French 'baniss-' (the stem of 'banir,' to proclaim, to exile, to banish), from Frankish *bannjan (to command publicly, to proclaim, to summon under penalty), from Proto-Germanic *bannaną (to speak publicly, to summon by proclamation, to curse). The PIE root is *bheh₂- (to speak, to say, to proclaim), shared with Greek 'phēmí' (I speak → 'prophet,' 'blasphemy,' 'euphemism') and Latin 'fārī' (to speak → 'fame,' 'fable,' 'affable,' 'infant' — one who does not yet speak). In early medieval Germanic law, a 'ban'
'Banish,' 'ban,' 'bandit,' 'abandon,' and 'contraband' all come from the same Germanic root meaning 'to proclaim.' A bandit was originally a 'banned' person — an outlaw proclaimed. Contraband was goods 'against the ban.' Even 'banns' (marriage announcements) preserve the original proclamation sense