'appealer' originates from the English verb 'appeal' plus the agentive suffix '-er', where 'appeal' ultimately derives from Latin 'appellāre' meaning 'to call upon, address'.

'appellāre' (Latin) passed into Old French as 'apeler'/'appeler' and into Middle English as 'appealen'/'appealen', later giving modern English 'appeal', to which the agent suffix '-er' was added to form 'appealer'.

Initially related to 'calling upon' or 'addressing' (Latin sense), the word 'appeal' evolved to include making a formal request to a higher authority and to attract interest; 'appealer' came to mean either 'one who makes an appeal' (legal) or 'one/thing that appeals' (attracts).