I have a William Wigart married to Elizabeth Mitchell (or Michel) in St. Clair County, IL in 1865. In 1900, William was in White County, IL living with children, stepchildren and grandchildren (and stepgrandchildren). He had at least two daughters, Minnie and Lizzie and a son, William. The only other Wigarts I've ever seen were in New York. Between 1865 and 1900, this family seems to have disappeared.