Thanks so much aghadowey and jorose for all your help. The name Newton is something I came across in Scottish archives. There was a George Newton Bonar born in Scotland in 1863 in Edinburgh, Midlothian. Then following from that, there is a George N living in Midlothian in the 1881 census. By 1891, he's married and has a son, also called George N born in 1888. This could be the George that I'm looking for. The names of the children of G N and Margaret Bonar would make sense then.
