'convivially' originates from Latin, specifically the word 'convivialis' (from 'convivium'), where 'con-' meant 'with/together' and 'vivere' meant 'to live.'

'convivialis' passed into French as 'convivial' and then into English as 'convivial'; the adverb 'convivially' was later formed by adding the English adverbial suffix '-ly.'

Initially it was connected with a 'banquet' or 'feast' (from 'convivium'), but over time the sense broadened to 'sociable, friendly,' and the adverb came to mean 'in a sociable or friendly manner.'