I find this incredibly hard to believe. I suppose it depends on your age but I’m early 40’s and had many of my friends since teenage years. Kinda hard not to learn someone’s surname after that amount of time.
Not to mention I used to be on social media in the early days and so surnames were a thing there.
rockerface@lemm.ee 11 months ago
The real unknowable is my friends’ patronyms (or, if they’re from EU/US, middle names)