Several of the later generations of this family spelled thier name Havner. One of the descendants of Obediah Havner 1813 NC d 1863 Marion Co TN is Obediah Havner who is in Yell County, Arkansas where my Hefner/Hefter family later relocated from Georgia.
What the relationship to Daniel Hefner is in Marion County Tennessee is unknown to me. I was right on your same trail looking for Hefner's in Tennessee who might be the father of your David C. Hefner b Feb. 12, 1812, Tennessee d abt. July 1, 1862, CSA Hospital, Oxford, Mississippi.
David C. Hefner is in the 1850 Census of Kemper County, Mississippi. There are other Hefner men with children born in the same time period...
Also I found this:
According to "The Story of Marion Co. its People and Places" c. 1990 by the Marion Co Hist. Soc. Johann Dierk Heifner and wife Elizabeth came to NC via the ship Phoenix from Heidleburg, Germany on 10/20/1744, where their name was spelled Hafner.
This info was written by James T. Dunwody. He decended from Obediah, Margaret Elizabeth, Anna Dunwody, James T. Dunwody.
According to the Marion Co Historian, I think her name is Harris, James died in the late 1990's. He said he was the last remaining one of his bro's and sis's.