'labeler' originates from English, specifically from the word 'label' plus the agentive suffix '-er', where '-er' meant 'one who performs an action'.

'label' changed from Old French words such as 'label'/'labeil' (from Late Latin 'labellum') and eventually became the modern English word 'label'; 'labeler' was formed in English by adding the productive agentive suffix '-er' to 'label'.

Initially, the root word 'label' referred to a small piece of cloth or tag (from Late Latin 'labellum'), and over time it evolved into the current meaning of an attached identifier; consequently, 'labeler' came to mean 'one who attaches labels.'