'ancestorially' originates from English, specifically from the word 'ancestorial,' which is derived from 'ancestor' plus the suffix '-ial' and the adverbial suffix '-ly.' 'Ancestor' comes from Latin 'antecessor,' where 'ante-' meant 'before' and 'cedere' meant 'to go.'

'Ancestorially' was formed in English by adding '-ly' to 'ancestorial,' which itself is based on 'ancestor.' 'Ancestor' came from Old French 'ancestre,' from Latin 'antecessor.'

Initially, it meant 'in a way relating to ancestors,' and this meaning has remained consistent in modern usage.