I went to a website that displayed 1,000 of the most popular boy's names (maybe of 2018 by childbirth), and although I probably could have done something better when it came to searching like only looking up British names or something, this kind of really still does cover the gamut.
https://www.whattoexpect.com/baby-names ... -for-boys/
Here are names that I found you can reverse to still make a boy's name, even if it's a stretch (and I want to note that Maximilien wasn't on there, but they did have Max, Maxim, Maximus, Maximilian, and Maximiliano):
Julien = Neil
Thomas = Sam
Nicholas = Sal
Douglas = Sal
Dallas = Sal
Atlas = Sal
Sylas = Sal
Connor = Ron
Joel = Leo
Coen = Neo
Clyde = Edy
Kylo = Oly
Magnus = (Sun) Sol
Rodney = Yen
Anakin = Nik
Soren = Nero (both names coincidentally mean "stern"; one of Danish origin, the other Latin)
Damari = Ira
Jamari = Ira
Jabari = Ira
Kamari = Ira
Dakari = Ira
Khari = Ira
Ari = Ira
Asa = Asa
Otto = Otto
Mac = Cam
Nova = Avon
Noel = Leon
So let's throw out a bunch of these immediately, mostly because they would be too obvious as they are either directly reversible, palindromic, or don't have nicknames to hide themselves from the fact. Then let's take away many others that are not of "white boy Brit" origin (this unfortunately would remove the Italian name Sal, which salvetorem Latin for "One who is a savior"). I'd also like to force "Cooper = Repo," as Repo could be a nickname for Arepo and Nolan has used Cooper in the past, bahaha!
Anyway, ultimately the only other one that really works here is "Thomas = Sam," which of course you can call him Tommy as a boy to hide it a little more.
So assuming the 1,000 name list is pretty adequate, what are the odds that Christopher Nolan just so happened to choose the
one pair of boy's names (out of two total pairs) which discretely exhibit some form of palindromic presence for the two film characters that also have more than one indicator as to possibly being the same person? There's no way that's a coincidence.
Now, many people are saying that Neil doesn't show much compassion for Kat. It's incredibly likely that Nolan didn't tell Pattinson and Debicki about this. I'm sure he didn't even tell his wife about this. This is a Nolan thing, something he'll take to his grave... just like the end of Inception, and according to some the end of Memento. The alternative, of course, is if Neil led too much onto the fact that he is Kat's son, then perhaps Kat won't be as motivated to be a part of everything that was integral in saving the world.