'charmer' originates from Old French, specifically the word 'charme' (from Old French 'charmer'), where the ultimate root is Latin 'carmen' meaning 'song, incantation'; the English agent suffix '-er' was added to form 'charmer'.

'charmer' changed from Middle English 'charmer' (borrowed from Old French 'charmer', from Latin 'carmen' meaning 'song, spell') and developed into the modern English noun 'charmer' (one who charms).

Initially it was associated with 'incantation' or a person who performs spells ('one who uses charms'); over time it broadened to include anyone who fascinates or attracts others by personal appeal, as well as retain the older sense of someone using charms.