As the previous comment says, it's pronounced KAHL-leh. My little boy is named Kalle and many non-Scandinavian people mispronounce it "Kallie". I still love this name though.
― Anonymous User 4/22/2011
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One famous Kalle in North America is Estonia-born Kalle Lasn, co-founder of Adbusters Media Foundation.
Kalle Blomkvist is the name of the boy detective in several children's books by Astrid Lindgren (of Pippi Longstocking fame). In the English translations he is called Bill Bergson.
In Estonia, this name both a borrowing of the Swedish and Finnish name and a diminutive of Kalev. [noted -ed]