Oh boy, this is going to be quite long. xD
So, first thing to keep in mind, when I came up with KudoJin I was originally planning on using these accounts as sort of social media outlets that I use for writing. I was originally planning on being an author, but I didn't want to publish under my real name. Obvious answer then is to use a pen name.
Kudo is a real Japanese last name, but I got it from Shunsaku Kudō, a former IJN Lieutenant who's known for the act of saving 442 British and American sailors in the Java sea (at a time when many other Japanese officers would have left them for dead, or worse). He acted in a way that saved the lives of enemy soldiers, he looked past the friend/foe mentality that dominated WW2 and just worked to save lives. I look up to that, so I took his last name.
Jin comes from something less serious. Again, it's a real Japanese first name, but I actually got it a different way. I'm a Trekkie. The person who made Star Trek is Gene Rodenberry. Gene in Japanese is ジーン (Jiin, long i), which sounds like ジン (Jin), which is the exact same way 仁 (Jin, as the way I write it in Japanese) is. Hence, Jin.
Put the two together and you have first name Jin and last name Kudo.
For YouTube I just let them decide the order of the name, but on most other social media I just use the Japanese order of names (Last Name, then First Name) and mush the two together to make KudoJin. xD
Side note, in Japanese the name would be written 工藤 仁, if anyone's wondering.