According to the 1851 census Stevenson Boyd, 39, was born in Ireland, as were his wife Margaret, 25, and their children Isabella, 8; William,5; and Robert, 3. Two more children, Hugh, 2; and John, one month, were born in Cambuslang.
The death of Stephenson Boyd, 65, was registered in Cambuslang in 1878, mother's maiden surname Stephenson.
So it does not look as if he is closely connected to the Boyd family from Cumbernauld.