'requester' originates from English, formed by the verb 'request' plus the agentive suffix '-er'. The verb 'request' ultimately comes from Old French 'requeste', and further back from Latin 'requirere' (re- + quaerere), where 're-' meant 'again' and 'quaerere' meant 'to seek or ask'.

'request' passed into Middle English from Old French 'requeste'; the modern English noun 'requester' was formed by adding the productive English agent suffix '-er' to the verb 'request'.

Initially related to 'seeking' or 'asking' (from Latin 'requirere'), the sense narrowed to 'to ask for something' in English; 'requester' therefore means 'one who asks or petitions'.