Nearly all of my stories are connected—my main series All That Jizz is based in 1926 but there is a childhood flashback to 1892 and a granddaughter series spanning 1968-1987—and nearly all of my characters have first and last names and specific ages. The main characters have birthdates, ethnic backgrounds, school histories, addresses, etc. Let's just say there's been a bit of fictional world-building in a real-world context.
I rarely use names of people I know—"Hey Chris, I wrote this filthy story with a guy named Chris but it has nothing to do with you!"—and I tend to avoid names that I personally dislike, because I'm writing these stories for my own entertainment as well. I aim for names that aren't super boring—Bill and Susan, yawn—but also try to avoid names that are too on point—Damian the demonic. I am guilty of naming my leading ladies Delilah and Daphne Davenport specifically so they could be double D's, har har... but it turns out that bra cup sizes weren't introduced until 1932. 🙄
My 1892 story În Vânt (Into The Wind) actually finishes with a scene at Ellis Island with the family getting its names Americanized by an immigration officer. Recommended Read, baby!
Here's an excerpt from another story, Lake Ossipee (Part 2 of 3), which shows you what I think about "Cathy"...
“So, is it Cassandra, then?”
“It’s Catherine,” she sighed, spelling it for him. “C-a-t-h-e-r-i-n-e. My parents loved the name but realized too late that people were going to shorten it to Cathy or Cath, which they hated, so I’ve been Cassie ever since I was a baby.”
“It’s cute, I like it. Cassie sounds like a fun chick, but Cathy sounds like a stick in the mud.”
“Sassy Cassie,” she laughed as she fetched a blanket from the couch.