There is a William Lewis matching your criteria at [[Lewis-13095|William Lewis]].
I put the information you gave into the Ancestry Library edition.
An Sons of the American Revolution application from Lester John Scheddler, Jr. of Pascagula, Jackson Co., Mississippi gave the following information
William Lewis (1740-1811) b. Scotland or Ireland d. Horry Co., SC. William was a member of the 2nd South Carolina regiment commanded by Col. Marion. he enlisted 4 Nov 1775 and was a private. He was married in 1774 to a Morning Van Pelt. I will add the information to Wikitree profiles.
I added this information to another profile [[Lewis-39110|William Lewis]] that I have proposed merging with the former William Lewis mentioned.
William and Mourning are buried in Midway Cemetery in Mullins, Marion County, South Carolina.