When Dr. Joseph Ervin St. Clair was born on 20 October 1883, in Mississippi, United States, his father, Thomas Lilly St. Clair, was 24 and his mother, Emma Louise Gaston, was 22. He married Cleva Stella Brown on 17 October 1906, in Wise, Texas, United States. They were the parents of at least 2 sons and 1 daughter. He lived in Justice Precinct 1, Wise, Texas, United States in 1900. He died on 26 July 1964, in Mineral Wells, Palo Pinto, Texas, United States, at the age of 80, and was buried in Woodland Park Cemetery, Mineral Wells, Palo Pinto, Texas, United States.
Americanized spelling of French St . Denis .