Hi,
As can be seen from a quick SP index lookup, Willian Smith Dixon’s wife was Catherine Ann Napier.
She was the daughter of late David Skene Napier, Singapore at her marriage in 1851, various notices in papers.
David Skene Napier was one of Macvey Napiers son’s.
If they did not have children, perhaps the children’s names they would have chosen?
David Skene Napier married Ann Margaret Dixon.
Not sure that it gets you much further with street names.