Jasper Whitlock.
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His full name is Jasper Whitlock Hale.
rosalie and jasper ARE cullens, its just the humans think they are brother and sister. but they ARE CULLENS
Jasper joined the cullens with Alice who had seen Jasper and the Cullens and therefore waited for jasper and then they went to join the Cullens the rest is twilight history
Alice and Jasper joined the Cullens in 1950.
Jasper's last name was originally Whitlock but he changed it when he joined the Cullens with Alice. Jasper uses whatever last name matches the current cover story being used by the Cullens. In Forks, he and Rosalie are pretending to be twins and foster children of the Cullens, so it makes sense that their last name would be the same and not Cullen.
Rathbone. His name in real life is Jackson Rathbone
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).
In Breaking Dawn, Alice forsees that the Cullens best chance of survival is if she and Jasper leave to search for another vampire-human hybrid. However, they had to keep it a secret from the rest of the Cullens so they wouldn't alert the Volturi.
Jasper Hale
there aren't any
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.