molly · noun, verb1
From Molly, the personal name, a pet form of Mary. In some cases it is possibly derived from mollitia (“softness, weakness”). Drug sense probably influenced by molecule, meaning MDMA.
molly · noun2
From Mollienesia, an invalid taxonomic name for the genus, influenced by the personal name Molly.
molly · noun3
Clipping of Molotov.
Molly · proper noun, noun4
From Moll, diminutive lambdacism of Mary + -y.
Etymology from Wiktionary, CC BY-SA 4.0.