Here is a Death Notice which I think illustrates why keyers and reviewers should not be expected to determine whether a name is in the format "Mrs John Smith". Hopefully this can be taken into consideration when instructions are specified for future projects.

If the death notice just stated Mrs Neville Taylor Gherardi, I would have assumed that Neville was her husband's given name because I have never come across Neville as a woman's name before, only as a man's name, so I would have keyed her as Mrs [Blank] Gherardi, spouse given name Neville Taylor, spouse surname Gherardi. The same if it had said "Mrs Neville Taylor Gherardi, widow of Rear Admiral Gherardi". It is only because it states her husband's given name that we know this would have been wrong.