Green’s Dictionary of Slang

jan n.

[ety. unknown; ? Rom.]

(UK Und.) a purse.

[UK]Jonson Gypsies Metamorphosed 4: Therefore, till [...] he be able to beate it on the hard hoofe, to the ben bowse, or the stauling Ken, to nip a Jan, and cly the iarke; ’tis thought fitt he marche in the Infants equipage.