Written reference to the superstitious fear of the number thirteen dates to the late 1800s. Its origin is conjectural (a matter of guesswork). The term triskaidekaphobia first appeared in the early 1900s. It was derived from treiskaideka, the Greek word for thirteen + phobia, fear of = a fear of thirteen. (Google search result)I'm a fan of all things thirteen. Imagine my surprise when I stumbled across this in my news feed;
Rebecca Watson, Did the Patriarchy Steal Friday the 13th From Women?
Thirteen is supposedly a bad number because the twelve disciples plus Jesus equals thirteen, the first reference that she offers for the fear of that day and/or number. I hadn't heard the cycles (moon, menstrual) argument before. I have never (and I do mean never) heard the triskaidekaphiliac women's day argument before.
The thirteenth is my lucky day. I was born on the thirteenth. I got married on the thirteenth because the wife insists I remember things that fall on the thirteenth day of the month. She also scheduled the births of our children (C-sections are like that) for the thirteenth of the month. It isn't her fault the children didn't actually emerge on those days (birth is like that) So when Friday the thirteenth rolls around I enjoy the double-whammy of good luck; my favorite day of the week and my favorite day of the month combined into one great day to celebrate.
What I'm trying to say is I of all people should have heard that one before, and I haven't. So I'm going to say Friday the thirteenth being a women's day is the fiction. Hope that clears it all up for you.