Oomis, good choice not reading throught the responses. I can summarize for you- mostly the usual CR stuff about Trolls, Trolling, and who may or may not possibly be a troll.
Since you do seem to wish to respond to the OP, I wanted to comment on something you mentioned: “There was NO such thing as last names centuries ago.”
You are right about that. What you surely realize as well is that centuries ago, and even decades ago, it was not common for Jewish women to work in offices and businesses where there was a great deal of interaction with members of the opposite sex. Jewish women stayed home and took care of their home and hearth, as did most women. Before World War I it was not common to find women working, unless they were domestics, midwives, or teachers.
It can be problematic to try to extrapolate from what was common centuries ago to solve problems we face in the 21st century. That’s why it’s always good to find a Rav (or Rebbitzen if you prefer) to talk things over with when important decisions need to be made.