'labeller' originates from English, specifically the word 'label', where 'label' ultimately comes from Latin 'labellum', where 'labellum' meant 'little lip'.

'label' changed from Old French word 'label' (a tag or strip) and from Medieval Latin 'labellum' and eventually became the modern English word 'label'; 'labeller' is formed by adding the agentive suffix '-er' to 'label'.

Initially, it meant 'a small lip or flap' (from Latin 'labellum'), but over time it evolved into the current meaning of 'a tag or marking attached to an object' and by extension 'a person or machine that attaches such tags'.