@bender@twtxt.net I misread that sentence and thought that your first crush was called Gisela, and was like “wait, he’s not that old”.
Turns out, Gisela is a much younger name than I thought:
https://namecensus.com/first-names/gisela-meaning-and-history/
A peak in the late 1970is and late 1990ies? What?
But then it turned out that, in Germany, the popularity dropped rapidly in the late 1950ies, which actually matches my expectations:
https://www.beliebte-vornamen.de/5203-gisela.htm
In other words, some other countries picked up the name Gisela after it had already faded away in Germany.
What a fun rabbit hole. 😅