Jaspers middle name is not actually revealed.
Whitlock was his last name when he was human.
Hale is Rosalie's last name. Rosalie and Jasper are supposed to be twins (because they are both blonde), which is why they do not take on the name Cullen (used by all the others in the family).
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Born Jasper Whitlock; changed to Jasper Hale when he joined the Cullens (he took on Rosaile's last name--Hale--to pass them off as twins.
Jasper (First name) Whitlock (Middle name) Hale (Last name) Although some people call him Jasper Cullen instead of Jasper Hale.Hope this helped! :D
Before Jasper was changed he was known as Jasper Whitlock.
Jasper's real name is Jasper Lee Whitlock Cullen. He takes on the name Hale so that people will think that he and Rosalie are siblings.
Jasper and Rosalie's last name from the book "Twilight" is Hale. They pretend to be twins and foster children to Esme Cullen.