Family name オルト (Olt 
, Ault 
, オルト) , in all the world, is a common cognomen. The last name オルト is habitual in U.S. Virgin Islands, where it is quite a common surname, Estonia, and the United States, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in the United States, the United Kingdom, and Germany. Very seldom, オルト is the forename as well as the last name.