This family has been well-researched by James C. Kirksey, who lives in Lubbock, TX. James is in his 70's & doesn't have a computer.
I am fortunate that I was given a copy of his work, so I can help you.
Ervin/Irvin Hatley Kirksey bca. 1850, prob. in Shelby Co. TX., died 1915 & marr. Fannie Mae Mauldin bca1859 & dca1887.
He was 2nd of 7 known children of Ervin L. & Louisa Jackson Kirksey. Children of Ervin L. & Louisa: James W. bc 1848b. Haywood Co, TN Irvin H. bc 1850b. prob Shelby Co, TX Sarah bc 1852b. Caldwell Co, TX Margaret bc 1855" John S. bc 1859b. prob Gonzales Co., TX Mary bc 1860b. Gonzales Co., TX Thomas Jackson bc 1863b. Caldwell Co, TX Ervin L. was the younger of 2 sons of Bryant H.(Herndon?) Kirksey & Lucinda Mauldin Kirksey. Bryant H. died young & Lucinda remarried ca1839 to John H. Brown. Ervin L.'s older brother was John Mauldin Kirksey. Ervin L. was killed in the Civil War, & his brother John Mauldin Kirksey then married Ervin's widow, Louisa, but she died in Dec 1872, less than 2 mo. after marriage.
Your researcher James C. Kirksey descends from John M. Kirksey. Fannie Mae Mauldin & Lucinda Mauldin Kirksey were related, because the Mauldins & Browns came out to Texas with these Kirkseys, & this is a case of them marrying back into each other's families.
Ervin L. was b ca 1824 in Madison Co, AL, & his family moved to Haywood Co, TN a few months after his birth.
Ervin L.'s wife Louisa b ca 1829 in TN, dau. of James Jackson, & Ervin and Louisa married ca 1847, Haywood Co,TN.
John M. Kirksey had married & had a number of his own children before he remarried his dead brother's widow.
John & Ervin's parents, Bryant H. & Lucinda M. Kirksey had come from South Carolina, where Bryant is supposed to be the oldest son of John Kirksey & Sarah P.Herndon Kirksey, who lived in Edgefield Co, SC, each having previously come from North Carolina, where possibly Bryant was born, if not Edgefield Co, SC, in 1790's.
John & Sarah Kirksey are my 3rd gr-grandparents, through one of their daughters.
Bryant m. Lucinda after they left SC, marr. 1819 Madison Co, AL.
Lucinda was daughter of James Mauldin, who came to Edgefield Co,SC before 1805, & I think lived in same neighborhood as the Kirkseys.