JK Rowling has become almost as famous as her creation Harry Potter, but what you might not know is that her real name is simply Joanne Rowling. She doesn't even have a middle name. The K in her pen name came from her paternal grandmother's name Kathlene. She was advised by her publisher to go by JK instead of Joanne because it was feared that young boys might not read a book written by a woman. Apparently the ruse worked at least for a while because her very first fan letter was addressed as "Dear Sir".