Hi,
Have been researching Lewis Edwards/ Margaret Duff as they are my husbands ancestors, have found out that Lewis changed his name in America, he married Margaret Duff, 23/5/1850 they had 6 children, and are both buried in a private cemetery in Company Bay, Dunedin Otago Pens. hope this of some help to you, have found a really good lot of information about them from a site " My Heritage Edward family website (Sue Edwards) in New Zealand, Margaret