When Margaret Amanda Carmack was born on 9 March 1838, in Sullivan, Tennessee, United States, her father, Joseph Carmack, was 48 and her mother, Sarah Patton Delaney, was 40. She married Bartholomew Fuller Gwinn about 1859, in Maryland, United States. They were the parents of at least 2 sons and 2 daughters. She lived in Saline, Missouri, United States in 1850 and Blackwater Township, Pettis, Missouri, United States for about 10 years. She died on 14 March 1912, in Missouri, United States, at the age of 74, and was buried in Pettis, Missouri, United States.
Probably a shortened and altered form of Irish McCormack (see McCormick ), or possibly of Carmaig, an unexplained Scottish name, also recorded as Carmag.