They used to call him "Uncle" Earl
Potassium is known by the abbreviation K+. It is not a nickname.
Earl Monroe a former professional nba basketball player for the Baltimore Bullets and New York Nicks. His nickname known as Earl The Pearl.
Crabman
"jimmy Carter"
He was called "The Kingmaker".
Earl Long's birth name is Long, Earl Kemp.
Jimmy is a common nickname for people called James. It's quite possible that James Earl Carter signed in as 'Jimmy Carter' to avoid being associated with James Earl Ray, the man who assassinated Martin Luther King.
Klueless
K-Dubb :)
Harry the K
Krish Browns
Dice-K