Right, that’s why I listed several languages where the surname is gendered, and people who are native to those languages (including their naming conventions) also live in Germany. Especially today, considering the exodus of Ukrainians.

For example, the current president of Ukraine is called Zelensky. His wife, who took up his surname, is called Zelenska. Or, there’s Putin, and his mother/sister/wife/daughter have or would have the surname Putina. The -y and “null” endings are masculine, -a is feminine.