At the risk of going too far back for the background:
At school at IUB, I spent my whole time there in Foster International, a special dorm where in-state students are (randomly) paired with exchange students. During those four years, I had a Danish roommate, a Finn, two Indians (one of them born and raised in Okinawa, Japan), and finally four Koreans in a row. It was not long after the first of these Korean roommates showed up that I was hooked on everything Korean. I learned to speak it (a little rusty now, but I was good in my day), going to Korean restaurants, Korean karaoke bars (and singing in Korean!), being the only non-Korean at parties, essentially becoming (in the words of some of my friends) an honorary Korean.
It was coming up on my birthday, and several of these friends asked what I wanted. 'A Korean name,' I said. So they went away and came back with 'ChulJin', a valid, if uncommon, Korean given name. Like the way-vast majority of Korean names, it's actually Sino-Korean (i.e. borrowed from Chinese), and, for the curious or those who know Korean, Japanese, or Chinese, the characters are:
Chul and Jin mean, respectively, 'iron or steel' and 'truth'. I didn't know it at the time, but coincidentally, and apropos here, Chul is also in many compound words having to do with railroads.
(q.v. by clicking the first character).
It's since become the handle/screenname/username/etc. I use everywhere online. At least one result on each of the first few pages of googling 'chuljin' is me. (#9, at least when I searched it just now, is my youtube channel with a few amtrak videos).