>>Today I visited the website of Christof Lange, oh sorry, I mean Christof Wollenhaupt. Until today I thought it were two different persons, but it appears that he married two years ago and has changed his last name.
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>>What puzzles me is that no one here has wondered how this is possible. As far as I'm aware of, there's no law that allows a man to change his last name when he gets married.
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>>Christof, are you reading along?
>
>Is it only in GB that we call it the "surname"?

We use surname and last name interchangeably. I'd say both are in quite common usage.