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Around the world, Callen (Kalla , カレン , Callen ) is a common epicene forename. The first name Callen is habitual in India, where it is quite a rare unisex name, Nigeria, where it is quite a rare principally masculine, but very infrequently female name, and Cameroon, where it is quite a rare gender-neutral name. In absolute terms, this name is the most popular in India, Nigeria, and Japan. Also, Callen is the last name as well as the forename.
Callen is also a prevalent name for the fictitious and mythical characters: Power Girl , the fictional character, Injustice 2; Karen Plankton , the fictional character in SpongeBob SquarePants; Karen Page , the fictional character in Marvel Comics, Daredevil; Bumblebee , the DC Comics character, Teen Titans and Karen Vick , the Fictional Character: Santa Barbara Police Department Chief, Psych, and in many other works.