The nickname of "The personification of cool" was given to James Dean.
because he was cool
Nicknames are earned. They usually are given by someone who observes your habits or some wild circumstance you were involved in.
Leo the cool lion that's cool
its not
Cool Pappa Bell was a player in the old Negro League. A native of Mississippi, Bell was elected by the special Negro League committee to the baseball Hall of Fame in 1977.
One cool nickname for Fiona could be "Fi." It's short and easy to remember.
skywalker
brantie
cool man
court
cool bananas