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You are right. I wanted "not trendy but not too different" names for my kids...had an Addelyn (F) in 2009 and an Evren (M) in 2013. Now Addy and Evy are two of the most popular nicknames out there! Fail. I teach music in two elementary schools, though, and have never had a student who goes by either. That could be attributed to the fact that my students are in a very different demographic than my own children are, but it was important to me when I was choosing names that I didn't want names of kids I'd taught.
This is so cool! My nerdy self loves the intersection of math and baby names. I also wonder if the pendulum swings both ways. Like, I'm sure it wouldn't have swung as far, but was there a wider rage before 1955, or was it even narrower then? I've heard some pretty unusual 1800s/early 1900s names, myself, even if they were mostly family names being used as first names.
I teach several Zaydens, plus lots of other Z and Q names, but not many X names. However, I think it varies greatly by demographic. The two elementary schools where I teach have a very high percentage of African-American students. I suspect the instance of Q names particularly would be lower and the percentage of X names higher in a school with a majority of Caucasian students. The Qs seem trendier in African American populations, while the Xs seem more popular among Caucasians, at least by my own anecdotal observations.
I wonder if there is also something to be said for people naming their pets from the various fandoms that exist today? A lot of people give those names to their pets instead of their kids. We sorta fit the trend of naming our pets things you like but wouldn't name a human. My husband's family had a tradition of naming pets after composers, so they had cats named Haydn and Sebastian, and a dog named Wolfgang. When my husband and I married, we decided to stick with foreign names because of how we named our dog (Mia). I had a student who had just come from Honduras and spoke no English. Her adoptive mother had found our dog and two other puppies in a box on the side of the road and taken them home, but she already had several other animals and couldn't keep them. So we went to look at the dogs after she put up a flier at my school. This student had become attached to one dog in particular, and brought us right over to the puppy, saying "Es mia perrita! Ella es mia perrita!" ("That's my puppy! This girl is my puppy!") in this excited, proud little voice. We decided to take that very puppy so that my student would still be able to visit and see photos. And so in her honor, we named the dog "Mia Perrita," or "Mia" for short. Our two cats have foreign names: "Katya," or "Kat," which is short of Ekaterina, because she was this gorgeous, sleek black thing who we imagined would speak with a mysterious Russian accent, and "Lana," short for Aslana, which is the Turkish word for lion...because her face is so lion-like. Recently, we acquired another dog that was abandoned near my school. We named her "Luna" for several reasons. First, she looked like a bat with her huge ears flopping around, so I immediately thought of the book Stellaluna (it's about bats and there's an adorable one on the front cover). Secondly, my daughter is a huge My Little Pony fan and I adore Harry Potter. There's a Luna in both (one is a princess who raises the moon and the other is an adorably strange and sweet girl who befriends Harry), so we got both our fandoms covered with "Luna." And the dog has proven to be both strange and kind of a princess, so I guess it worked out.
I forgot to say that my mom just named her new mini dachshund puppy Bowie, after David Bowie, but my brother was really pulling for Rufio (from the movie Hook with Robin Williams). Her other dogs are Rio and Leia, and my brother's dog's name is Brego. not sure where that one came from, to be honest. My sister's dogs are Nancy and Wallace, so she likes the older, less popular human names. My in-laws like traditional pet names. Lots of cats: Buster, Kit, Marbles, Baby, Dot, etc. Whereas my brother-in-law and his wife named their two pit bulls Tank and Dozer.
As a musician and music teacher, I second Cadence. It's a great, strong name for a girl. I wrinkled my nose at Madrigal, though. To me, it just doesn't make any sense as a name. Aria, yes...Selah, even Jazz. But no thanks on Madrigal!
The suggestion of Niall makes me think of Tames, i.e. a phonetic spelling of the "Thames River" in the England. I think both would be good matches for Ryne.
I was expecting to see Chanel on this list. I have had several students by that name. I have also known a Tonka and a Dasani, though I did not teach either.
I think Ellee is perfect given the criteria. It has a double E so it continues the pattern, if you're picky about that stuff like I am, two syllables, and she can go by Lee if she likes. Grace sounds good as a middle name with it. My second suggestion was going to be Lexee, but you've got that one, too! I completely understand about the teacher name aversions- I teach K-5 general music, so I have literally every child in the school (at two schools, no less!). I already have associations with many, many names.
Ringo was actually born Richard Starkey. sharalyns is correct that he adopted the stage name "Ringo Starr" at 19. Though it would be hard to track babies named Richard (or Ritchie) as they relate to Beatlemania, and Starkey's not exactly a common given name!