I have not tracked all the children of Edmund and Polly Harvey Dunn, their children descending. I I descend from daughter Jane, who m. George W. Maddy, 29 Nov 1838 in Shelby Co., Indiana.
Her siblings were John H. Dunn, Edmond/Edmund, Lewis, Belinda, Emily and Rhoda. There may have been more.
John H. Dunn m. Nancy Ballard, Edmond/Edmund m. Mary Thompson, Lewis, m. Emeline Harcourt, Emily m. Oliver Halterman, Rhoda, m. Madison Chapman, Belinda, m. Arrass Wagoner. The dates for these marriages are listed at Indiana State Library, go to Marriages before 1850.
Edmund married again, Parmelia Kesler, Rush Co., IN, 14 Nov 1843.
John E. Harvey and Lucy Estes or Elizabeth ? were her parents. They lived in Monroe Co., Virginia (WV). No documentation that I can find for Edmund's parents. There are several early Dunns in Monroe Co., VA (WV). who could be his parents, can't find proof at this point.
Very slowly piecing together this family. Nothing was documented that I could find.
Your Dunn could very well be a descendant of one of Edmund & Polly Harvey Dunn's children.
Let me know if and when you are able to find any proof of belonging to this family. Please let me know if I can help you.