Possibly a variant of Charmian, influenced by names such as Germaine, but more probably an invented name based on the vocabulary word charm + -aine as in Lorraine. It is not found before 1920, but has enjoyed some popularity since the 1960s, when it came to notice as the title of a hit song by The Bachelors.
English: 1. occupational name for a slaughterer of animals, from Middle English slahter (an agent derivative of slaht ‘killing’). 2. topographic name from Middle English sloghtre ‘boggy place’, or a habitational name from a place named with this term (Old English slōhtre), for example Upper and Lower Slaughter in Gloucestershire. 3. topographic name for someone who lived by a blackthorn or sloe, Old English slāhtrēow.