I’ve heard of Wednesday Addams (not real) and Tuesday Weld (real but it was a nickname she adopted). I’ve never heard of real or fictional Mondays or Thursdays or whatever.
Were these (or any other days) ever common names for girls?
Also, I’ve heard of January Jones, and I went to school with a dozen or so Aprils. May and June aren’t really common for girls/younger women these days, though a few generations ago things were different. Have other months been common sources of names (boys OR girls)?
Jasper Fford has written a series of comic alt-fantasy novels whose main character is Thursday Next. Robert Heinlein wrote a novel about an artificial human named Friday.
I don’t think day/month names have ever been common, but they certainly haven’t been rare.
I always assumed the main character in Fahrenheit 451, Montag was named after the day of the week (in German) but apparently it’s just a variation of Montague or Montgomery.
We can easily go a way towards answering this question: I downloaded a few lists of popular U.S. names from here. I did not see any Tuesday, Wednesday, Tiw, Tyr, Odin, Woden, etc but I did not comprehensively check them all. Doesn’t seem really popular.
I went to college with a very cute girl whose name was September. Yes, she was born September 1st. And yes, she was very tired of being called Miss September.
I had an aunt named June, also born on the first day of the month.
I went to college with a woman named Alison, whose hippy parents gave her the middle name “Wonderland.” Her name was Alison Wonderland Jones (or whatever).
She complained about that name, but stopped when her parents told her they’d planned to name her August, since her due date was August 25th. But she was a week late, and her mother went into labor after dinner.
As she was delivered, the father said “Look, it’s a healthy baby August!”
The midwife looked up at the clock and said "Well, since it’s 12:01, she’s the hospital’s first September baby. The mother smiled at the father, “Like you said, it’s a healthy baby September!”
In the southern US there’s a practice for children to call adult females “Miss ”. So “Miss June”, “Miss September”, etc. would just be an ordinary form of address.
Same for July, of course. While most people seem to go with the standard human-nomenclature variants like Julius, Julian, Julia, Julie, etc., there are some people with the given name July.
As for weekday personal names, that is apparently more of an actual thing for babies born on Sunday. There are a number of Romance-language names for Sunday that are similar/equivalent to common personal names, because of the whole “Lord’s Day = dies domini” thing.