Katherine f. Greek Αἰκατερίνα or Αἰκατερίνη, of uncertain origin. It is unrelated to Greek καθαρός 'pure', though it later came to be associated with that root.
The name of a 4th C virgin martyr who became an extremely popular medieval saint, a 14th C Swedish saint, a 14th C Italian saint, a 15th C Italian saint, a 15th C queen consort of England, a 15th C queen of Castille, a 15th C queen of Navarre, a 15th C queen of Bosnia, a 16th C queen of France, three 16th C queens of England, a 16th C queen of Portugal, a 16th C queen of Poland, and two 16th C queens of Sweden.