When I first started working in advertising, I had a client whose birth name was Charles Obusek. He went by “OB” (pronounced OH-bee, like in “Obi-Wan”), clearly based on his last name. I’m not sure exactly how that nickname came about, but I do know that he strongly disliked being called by his actual first name.
The husband of one of my best friends is known, to everyone, as Rick. His legal first name is Charles, and “Rick” has nothing to do with his first name, his middle name, nor his surname. When he went to Marines boot camp, there were two guys named Charles in his training platoon, which apparently would not do; someone started calling him “Rick,” and it stuck.
U.S. sports seem to not have many of the sort of fun and well-known nicknames that they used to; most commonly-used nicknames for athletes are just shortenings of their names (particularly ones like “A-Rod”).
But, that said, some of my favorites from the past include:
The Human Vacuum Cleaner (Brooks Robinson, third baseman for the Orioles)
The Penguin (Ron Cey, third baseman for the Dodgers; the nickname came from his waddling strde)
The Human Rain Delay (Mike Hargrove, first baseman for the Indians; the nickname came from his long at-bats, in which he’d step out of the batting box after each pitch to adjust his gloves, in an era in which that was an unusual habit)
Back in college, I knew a guy whose actual name I can’t even remember but, in a weird fit of fancy, I decided looked like a “Spence”. So I started calling him Spence and then other people in our group started calling him Spence and that just sort of became his name. By my last year, he was just known as that to his girlfriend and everyone else and, from what I understand, the next year (after I had left) had his car license plate changed to “SPENCE”.
I dunno if that counts as a good nickname but it’s the first and only time I unilaterally changed someone’s name for all practical purposes.
I know a grappler who unintentionally ‘checked another guy’s oil’. The other guy complained about it a LOT, and the first guy got known as “The Mechanic”.
Being born in the 50s, several of my friends are named David and Mike. The Davids are Dr. Jive, HDP and Quigg. The Mikes are Lefty, Melrose and Smitty. And, of course, there are the Debbies. They are Prudence and Lissa.
I was stationed with a guy in the Navy named Maynard Lipp. He used to joke that he was glad his mother didn’t name him Richard or he’d be called Dick Lipp. So of course. . .
I, too, am a Mike (born in the mid '60s); I have always had multiple other Mikes in my school classes, jobs, etc.
In high school, I was one of seven Mikes in my class of 75 boys; friends nicknamed me “Pistol Pete” (after basketball player “Pistol” Pete Maravich), not because of any basketball skill I had, but because it differentiated me from the other Mikes, and “Pistol Pete” rhymes with my last name.
In college, there was always at least one other Mike in my dorm; I got nicknamed “Herb” during my junior year, after the nerdy guy in the infamous Burger King ad campaign from that time. I didn’t particularly like that nickname, but it did stick until after I graduated, to the point that there were people in the dorm who did not realize that my given name was not actually Herb.
My favorite one of my friends was a buddy who came down with a very rare lung infection when he was in his 20s. Over 90% of people who got this infection are Black women who are over 60. His nickname: The Queen of Soul.
At one point I had two housemates both named Dave. In an inspiration of absolute brilliance (but you’d have to know them) I dubbed them Sparky and The Chief.
My baby brother is Harry. He didn’t like being called Potter or people hollering "expelliarimus" every time he was introduced. He set out on a campaign to change his going-by name.
Alas, he ended up with Herman. Caused another set of issues.
His second wife didn’t even know his name was Harry til they married. She called him Herman til they divorced. That’s ok, we couldn’t quit calling her his first wife’s name. Alicia and Allison.
Hey, we didn’t expect her to stay any longer than the first one. So we were not real motivated.
I had an acquaintance in college who I knew for years as “Crackers.” I can’t remember his real name now. Darren, Darrell? Nickname came from him getting very high and eating an entire box of saltines.
I’ve got a friend “Zilla” who is a really large strong guy actually named John.