'appealer' originates from English, specifically formed from the verb 'appeal' with the agentive suffix '-er'.

'appeal' changed from Old French 'apeler' (to call upon) and ultimately from Latin 'appellāre' (to address or call upon), and the modern English noun 'appealer' developed by adding '-er' to 'appeal'.

Initially, it meant 'to call or address', but over time it evolved into meanings such as 'to make a formal request (especially to a higher court)' and 'to attract'; 'appealer' thus means 'one who makes an appeal' (or, rarely, 'that which appeals').