Here's how I got my two radio names. I was named after a friend of my father who was murdered in college. His name was Kent Scout. That was the name I was supposed to use on the radio for my first overnight. The nighttime jock incorrectly introduced me as, "Kent Scott." The PD was there for the first hour to train me, and he said, "I guess you got a new name, Scout!" After that, it just stuck!
I also used "Kent Clark," and I got that one much the same way. I had not been on the radio for quite some time. I got a chance to play around at a college station near Kansas City, and someone at my real job during the day used to always call me "Clark" purely by accident. So, the PD, who, last I heard, was working at WHB in KC, suggested I just go with "Kent Clark" for my radio name.
So, I've generally used "Kent Scott" at news/talk, AC, and classic hits stations and "Kent Clark" at rock and top-40 stations!
By the way, I also named two weekend jocks at other stations I've worked at. One of them went by the name "Kathy Rose" after she couldn't think of a name to use herself. Her first name was Kathy, and I suggested she use "Rose" for her last name because "Cathy Rose" was a girl I had a crush on in junior high! I also named a friend of mine "Morgan Rocket" after a former college classmate. When she got married, her name went from Bowles to Rocket, and I just thought it sounded cool. My co-worker was told she needed a male-sounding name on our top-40 station, and she was thinking about Taylor. However, I had another friend, who's now on WIHT 99.5, who used "Taylor Shay" on the radio. So, I suggested she use something a little more distinctive!