Citing an author who changed his name
I would distinguish between narrative and citation. In narrative text, it is best to refer to a person by their current most preferred scientific name. In citation, on the other hand, it is best to provide the information that will best guide lookup of the document in various search and databases.

When the two are not clearly connected,  giving a footnote or parenthetical note will help make it clear to the reader that the difference is intended and not accidental, but it is not strictly required.