'archpastor' originates from Greek and Latin elements, specifically the Greek prefix 'archi-' (from ἀρχι-, meaning 'chief') combined with the Latin word 'pastor' meaning 'shepherd'.

'archpastor' developed as a compound in ecclesiastical Latin and later entered English usage to denote a principal pastor or senior cleric, evolving from separate classical elements into a single ecclesiastical title.

Initially it meant 'chief shepherd' (a literal compound of 'archi-' + 'pastor'); over time it came to be used more specifically as 'principal pastor' or 'senior cleric' in church contexts.