Marrano (n.)

also Marano, "a Jew or Moor in Spain who, to avoid persecution, publicly professed conversion to Christianity while privately continuing in the practices and beliefs of their old religion," 1580s, from Spanish, probably literally "pig, swine," an expression of contempt, from Arabic muharram "forbidden thing" (eating of pork is forbidden by Muslim and Jewish religious law), from haruma "was forbidden" (see harem).