A James and William Delvin - brothers emigrated to the United States about the time frame you mention. They settled in Uttica New York. James never had children. William had a family. Descendants of William settled in Dunkirk New York and then moved on to Hunnington Indiana and Allegan County Michigan. I am descended from James who lived in Michigan. It is a difficult name to research because of the multiple spellings of the name. My James I have found 4 or 5 different spellings in legal documents, and he was a lawyer. Delvin, Devlin, Delevan, Delvan, Delvine.