Short form of Edward, originating in the misdivision of phrases such as mine Ed (compare Nan). It was common in the Middle Ages and up to the 18th century, but in the 19th was almost entirely superseded in the role of short form by Ted. It is now, however, enjoying a modest revival, also as an independent given name.
Scottish and northern Irish: reduced form of McTaggart, an Anglicized form of Gaelic Mac an t-Sagairt ‘son of the priest’, from sagart ‘priest’. Marriage by members of the clergy was prohibited after the 12th century, but was frequently practised nevertheless.