The nickname of Mary, now called Molly. Hence the Maid Marian is so
A kitchen wench, now called a Molly, is by Shakespeare termed “the
kitchen Malkin.” (Coriolanus
, ii. 1.)
A scarecrow or figure dressed like a scullion; hence, anything made
of rags, as a mop. Malkin.
A Moll or female cat, the male being
a “Tom.” When the cat mews, the witch in Macbeth
calls out, “I
come, Grimalkin” (i. 1).
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on Malkin from Fact Monster: