192.com only lists two people with the surname Campbell Brown in Glasgow (Beatrice M and Robert C) and they've not been on the edited register since 2002 (but that might just mean that they've elected not to have their names included on the edited electoral roll).
[Oddly, you need to hyphenate the surname in a search, in order to get the unhyphenated results]
192.com lists 128 people with the surname Cant currently in Glasgow (but, once again, there will probably be more who've simply had their names excluded from the edited roll). They include 4 Williams and a Harry but you'll have to subscribe to see the details.
As has been suggested, the Genealogy section (which is a subsection of History) might be the best place to post.