How is Aleksander's last name Tiedemann? Did he take his wife's last name? Is that common in Germany?
That's not his real name. He was running from something/someone in his past so I assume he took the name to cover things up.
Aleksander Tiedemann is not who he claims to be. When he came to Winden, 33 years ago, he buried his true identity in a platic bag in the forest: A passport in the name of Boris Niewald.
Yeah, I understand that is not his real name but you don't just go into a town and meet a girl and then take her last name. That would be weird.
The name on his fake passport is Aleksander Kohler.