Let me add another line: There are Corams in Missouri, originally Linn County, and related Corams in Ohio, and Ontario and Alberta, Canada. These Corams are descendants of a family headed by William G. Coram that immigrated to North America from Devon, England, in 1856.
Also, let me update your information on Capt. Thomas Coram. He was born in Lyme Regis, Dorset, England in 1668 and died in London in 1751. He established the London Foundling Hospital, which took in children that would have been abandoned in the streets otherwise. It was the first publicly chartered charity, held the first charity concerts, and exhibited its donated art collection to the public. He was a Trustee of the Colony of Georgia, but he never went to Georgia. He did build ships in Massachusetts and married an woman, Eunice Waite, from Boston. They never had children. So I don't think "spreading his seed" is at all likely; in fact, given his character, it's probably libelous. It appears that the Corams of Georgia took the name Coram in honor of Capt. Thomas Coram, but were not born Coram. The town of Benevolence, Georgia, is also named to honor Capt. Coram.