European royal families didn't generally use last names. So, "of Aragon" may be as real a last name as you'll find for her. Her full birth name in Spanish was Infanta Catalina de Aragón y Castilla or Infanta Catalina de Trastámara y Trastámara.
Paul Revere's real last name was riviore.
his real name was aldolf, but people started calling him by his last name.
Stalin's real name was Joseph Vissarionvich Djvugashvili
Do you mean Brittany Susan Pears from Glee? If you do then that is her real name!
Her real name is Justine Ezarik
Catherine Ford
Cat Osterman's real name is Catherine Leigh Osterman
Catherine Medios
Yes! It is an Irish derivation of the name Catherine.
As in, her actor's name? Catherine Tate.
herloterlots
The real name of Catherine II, The Great- Czarina of all the Russias from l762-l796.
Catherine Elizabeth Hudson
Catherine Elizabeth Robinson is Katie Robinson's real name ~( randomer) x
Kitty is short for Catherine.
Her real name is Rena Sofer.
His real last name is Ochocinco.