Jarl

Jarl Brum is a character from the novel "Six of Crows", the first book of a duology set in Leigh Bardugo's GrishaVerse. He is the commander of the Drüskelle, mentor of Matthias Helvar and father of Hanne Brum.

Birger Jarl was a Swedish statesman and the founder of Stockholm. Jarl Kulle was a Swedish actor.

Birger Jarl was a Swedish statesman, as noted above. But his real name was Birger Magnusson. Jarl was his title and should be spelled with a lower case letter: Birger jarl.