A) According to Wikipedia:Naming_conventions the title should be the most common name that isn't offensive to large groups of people.  B). The name is very common, as the Google results show, but I agree that it may be offensive to large groups of people (on one side of the wall) so maybe it shouldn't be the title but it is a very common name and the page Apartheid Wall redirects here so it should be listed in the first line as one of the names that the wall is called.