At various times, the origin and meaning of the name has been popularly misinterpreted. This name was in ordinary use prior to 1600, but only as a man's name. In medieval records, it appears in ordinary use as the name of both men and women. This name was in ordinary use prior to 1600 by both men and women. Although Welsh and Irish are different languages, they come from a common root.
Many Irish words have counterparts in Welsh which derived from the same origin.
When Morgen was being used, the second appeared as Morcant , and when Morgan was being used, the other appeared as Morien . The two are not interchangeable. This name was in ordinary use prior to 1600 as a man's name. Now we come to the Great Confusion. Geoffrey of Monmouth was a historical writer in the 12th century.