'anthropomorphizer' originates from Greek elements: 'ánthropos' (meaning 'human') and 'morphē' (meaning 'form'), combined with the verb-forming suffix '-ize' (from Greek '-izein' via Latin/French) and the agentive English suffix '-er'.

'anthropomorphize' entered English via New Latin and Middle French formations based on Greek 'anthropo-' + 'morph-' + '-ize'; the agentive suffix '-er' was later added in English to form 'anthropomorphizer'.

Initially it literally meant 'to give human form' (or 'to ascribe human form'); over time it broadened to mean 'to attribute human characteristics or intentions' and the agent noun 'anthropomorphizer' describes someone who does this.