The info I found on Mary Eckles was found in a book LAMBERT FAMILY pub. 1979 by Alton Lambert, 8 Juanita Dr., Tuscalossa, AL 35404. On pg. 25 -
Robert Edward Eccles (Eckles), native of Dorchester, Mass., moved to South Carolina, then to Midway, GA. He was born about 1730. The name of his wife is unstated. The only child named in the Bible is: Mary Eckles. b. 1730, d. 8 Jan 1820,:in her 70th year" mar. ca 1764 Luke John Morgan. (Other siblings probably would not be listed in the Morgan Bible.)

Info for this part of book is taken from the Morgan Family bible, microfilm at Georgia State Archives where copies can be obtained. The book is poorly documented, but I received copies of the handwritten entries which is part of the above.

If this helps, great. If you have info that connects us, please share. Thanks, Peggy