Christopher Birk's birth name is Kristoffer Birk Petersen.
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Matt Birk's birth name is Matthew Robert Birk.
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Birk is the true last name of the legendary jazz trumpeter Dizzy
Gillespie. He's born as John Birk en wrote 'Birk's Works' years
after he was nicknamed Dizzy Gillespie, because of his clownesque
behaviour.