Of uncertain ultimate origin. This was the name of the mother of St Augustine, as transmitted to us by her famous son. She was a citizen of Carthage, so her name may well be of Phoenician origin, but in the early Middle Ages it was taken to be a derivative of Latin monere ‘to warn, counsel’, since it was as a result of her guidance that her son was converted to Christianity.
English: 1. occupational name for a maker of plate-armor or armor-plates, from an agent derivative of Middle English plate ‘armor-plate’. 2. from an agent derivative of Old French plait ‘plea’ or plaitier ‘to plead’, hence an occupational name or nickname for an advocate.