What was Jasper Hale's Last name?

her last name is Cullen but they call her last name hale.

Okay first of all Jasper is not a "her". The Olympic Coven (better known as the Cullens) change their sirname when they move to a different place, so they can't be tracked down. At the point in their "lives" shown in the series, most of the coven happen to be using the name Cullen, however Jasper and Rosalie choose to use the name Hale so as not to raise suspicions at their relationships with Alice and Emmett.

that's not the only reason they use Hale. Rosalie is just so superficial that she wanted to keep her human last name. Also, if u want his human last name, it is WHitlock. Jasper Whitlock Hale.

OK, here is the real deal about the Hale thing. ROSALIE wanted to keep her last name not because she's superficial, even though she is a little, but because she never wanted to be a vampire. JASPER is a Hale because he looks so much like Rosalie that they pretend to be twins. DUH!