'banter' originates from English (recorded in early 18th century), specifically the word 'banter' in early modern/slang English; the exact root is uncertain (possibly related to dialectal speech or obsolete words), so the ultimate origin is unclear.

'banter' appeared in informal English (c.1700) meaning 'to tease or ridicule' and through continued use in spoken language evolved into the standard modern English verb and noun 'banter' with senses of playful teasing and witty exchange.

Initially it could imply sharper ridicule or mockery, but over time the sense softened and stabilized to the current meaning of light-hearted, good-natured teasing or witty conversation.