There's also Ulysses S. Grant. The "S" was apparently just a mistake on his enrollment at West Point. His birth name was Hiram Ulysses Grant. He tried to switch his first and middle names, but ended up with the initials USG instead of UHG.

https://www.britannica.com/biography/Ulysses-S-Grant

Homer Jay Simpson Or Homer J. Simpson

If his name is S why is there a period... like an abbreviation.

I had a friend like this in college. His name was AJ. That's it. Just the letters.

Everyone in the department spent ages trying to guess what it stood for. I managed to glance his ID when we got lunch together once. His name was just AJ. There weren't even periods marking it as an abbreviation.

Still haven't told anyone though

S and a dot apparently.

My grandpa's name was Larry. I had always assumed it was short for Lawrence. I just found out recently like 8 years after he died that it wasn't even short for that. Apparently my illiterate great grandparents wanted to name him Larrington (which I'm 90% sure isn't even a first name in the lexicon). Apparently my great grandmother wanted him to grow up to be Larrington the Lawyer. My guess is that was a name of a local law firm she had heard of something because it definitely sounds like a surname that you would hear on a law office advert, (i.e. call Larrington and Mitchell). Turns out they couldn't spell Larrington and just decided to name him Larry for short. So his fucking birth certificate has a nickname on it for a name he wasn't even born as. My mind was fucking blown hearing this.

That also reminds me of this one public speaker back in 30 A.D. Jesus H Christ. Apparently the H is just an H. Who woulda thought.

J Moore, the Moore in the wildly used Boyer-Moore string search algorithm, has a first name of a single letter, J. It's not an abbreviation.

I used to work with a guy that was from China. He only had a first in a last name. He was going to college here and the college required everyone to have a middle initial as part of their login. They just used his last initial as his middle initial.

A friend in high school had a middle name of "J"

Hairy Ass

Monkey D. Luffy type shit

I'd tell people my middle name was "S" too if I were a boy middlenamed Sue. How do you do?!

Harry "Cool S" Truman

Back in the 90’s I worked for a guy whose first name is “H”.

What a coincidence. I never knew this despite my penchant for useless trivia but just yesterday at an airport I overheard some high school kids asking each other trivial pursuit questions and this was one. The next day: this post. Uncanny.