Working from Paolo‘s idea that you could find the correct spelling for your last name on Google, I tried a common way people get “Hershberger” wrong. Sure enough, Google suggested the right spelling. Which leads me to conclude that there are far more Hershbergers online than Hershburgers.
And I note that I am the third Hershberger after Hershberger Designs Polymer Clay and Arizona state Rep. Hershberger.
Since I was ego-surfing, I just checked and its good to know I beat out the other Mark Hershberger.