Thank you for that cutee informationnn. So basically their name is literally their nickname in English. Fool
It's could be both ways...like author doesn't have better names for them so they are just using nicknames, or could be that translation team was confusing their Chinese names as nicknames. Wolf King might not be his real name, but a title he is known among his subordinates by...
Finally got my cutie little buzz cut's namee. I've been wondering for yearss.