Bob, The Girardeau family of SC has only one Thomas C. Girardeau who would be the correct age for you, to my knowledge. I would be interested to learn if you have discovered any more information about the Thomas that you list in this Query. Perhaps our burial information is incorrect!
This is the information that we have on Dr. Girardeau: DR. THOMAS CAMPBELL GIRARDEAU, C.S.A.: Burial: St. Philip's Churchyard, Charleston, SC. Education: Bet. 1849 - 1851, Medical College of South Carolina Graduation: 1849, College of Charleston Military service: Bet. 1861 - 1865, Twenty-Sixth South Carolina Volunteers, Lucas' (15) Battalion, Heavy Artillery. Occupation: Physician. Married: Adelaide Victoria Perry (3 known children) Parents: Isaac Williams Girardeau & Margaret Thomasine Cox
Freedman Papers ST. Bartholomew's Parish Chyhaw Neck "Hazelwood" 878 acres Adelaide V. Girardeau her husband D. T. C. Girardeau taken prisoner 12th Feb. 1865. Last will and testament of her Father Wm. Perry devised & bequeathed unto Wm. Fripp Esq. in trust for the sole & separate use of your petitioner & her children. Capers Lowery Esq. overseer. She had fair complexion, dark hair, gray eyes was 5' 3" high age 28 and by profession a wife.