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I do not know if this will be of any benefit for you or not but I found an Eyra or Ezra in the 1850 census as follows: 1850 Federal Census, Marion County, South Carolina, Page 61, 24 August 1850, Building 463, Family 466, Line 27, Obed POSTON Age 35, male, white, farmer, born in Marion District, South Carolina. Wife: Martha POSTON Age 33. Children: Margaret POSTON Age 9, female, Eyra (?Ezra) POSTON Age 7, male, Sarah POSTON Age 6, female, Mary Age 4, female & James POSTON Age 1/12, male.
Unfortuately, I have not had time to follow up further research but it may give you a lead you do not have.