All I know about William McComb is that he was the second husband of Eliza(beth) Campbell, nee Barkley - spelling may differ.
He was born in 1793, died in 1873 and was buried at Hillsborough, Northern Ireland.
Eliza was previously married to Captain Robert Walkinshaw Campbell who died before 1830 which was when she married William.
She had two daughters I know of, with Robert. They were my great grandmother, Mary Campbell,b.1811, and her sister Eliza Walkinshaw Campbell.
I am hoping someone can give me some information about the McComb family, or even the Campbell family.