Even after using Google it's not an easy question to answer.
Stonewall Jackson (he didn't even enter my mind)
Jeb Stuart - he was an interim commander between Jackson, suffering from an ultimately fatal injury, and Ewell who was officially given command after Jackson's death.
Do we count Stuart? Is he a "fifth" commander?
I say post the answer and let's get another question going...this one is making my brain bleed.