Unfortunately, I have no idea which one he may be, although I think he may have died in 1847 in Glasgow Scotland. I have not been able to find him on the census. He was married to Catherine Whitelaw who I cannot find any info on her at all.
My gg grandfather was also Neil Campbell born around 1811-1814 in Co Londonderry and died in Scotland 1858. I have his death certificate which states parents Neil Campbell (Handloom Weaver) and Catherine Whitelaw both deceased.
Not sure what to do now
Cheers from Australia (KAY)