Yes, Oswin Alexander was b. 15 May 1799 in Iredell County, North Carolina (according to his family's Bible record) and d. ca 1886 in Rutherford County, Tennessee.
I can give you more information including his wife's name and children's names. I can also put you in touch with someone who is a direct descendant of Oswin. I descend from Oswin's brother, Reuben.
If you click on my name (above) it will open the next page which not only gives my Email address but will show you all of the Alexander GenForum entries that I have made. There is a lot of information in those messages. Perhaps you will find a link or at least a clue to help you.
Please do get in touch again if you think I can help.