Jasper's last name in the books and movies before he became a Cullen is Hale.
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Jasper and Rosalie's last name from the book "Twilight" is Hale. They pretend to be twins and foster children to Esme Cullen.
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.
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 (First name) Whitlock (Middle name) Hale (Last name) Although some people call him Jasper Cullen instead of Jasper Hale.Hope this helped! :D