Perhaps a development from the name of a Hindu goddess Minakshi an earthly manifestation of the Goddess Parvati and has a temple dedicated to her at Meenakshi Amman Temple in Madurai, Tamil Nadu, India. Simson (1865) also suspected that the form Managie ‘...signifies the name of a person, such as John or James.’
Form manishie also attested by Canadian Paul Pope (2013) which he defines as: ‘a slang term for a woman’.