"manufactured goods, goods for sale," Old English waru "article of merchandise," also "protection, guard," hence probably originally "object of care, that which is kept in custody," from Proto-Germanic *waro (source also of Swedish vara, Danish vare, Old Frisian were, Middle Dutch were, Dutch waar, Middle High German, German ware "goods"), from PIE root *wer- (3) "perceive, watch out for."
Usually wares, except in compounds such as hardware, earthenware, etc. Lady ware was a jocular 17c. euphemism for "a woman's private parts" (but sometimes also "male sex organs"), and Middle English had ape-ware "deceptive or false ware; tricks" (mid-13c.).
liquid measure (in modern use commonly a quarter of a pint), late 13c., from Old French gille, a wine measure, and from Medieval Latin gillo "earthenware jar," words of uncertain origin, perhaps related to the source of gallon.
also piggie, "a little pig," by 1700, from pig (n.1) + -y (3). Related: Piggies. The piggy bank was popular from 1940 (ceramic or tin pig banks are noted by 1903 in American English, sometimes as souvenirs from Mexico).
The dates seem too early for this to be a source of that, but Scottish and Northern English pig (of unknown origin) meant "earthenware pot, pitcher, jar, etc." (mid-15c.), and in Scottish dialect pirlie pig (1799) was "small money box, usually circular and made of earthenware."