The leader of the Alderaan Flotilla, a group of starships that housed the Alderaanians who lived through the destruction of their homeworld, Alderaan, was known as the Regent Administrator. Eglyn Valmor occupied this position in the year 5 ABY.
Chuck Wendig's novel, Aftermath: Life Debt, which came out on July 12, 2016, was the first time the title of regent administrator was used.