Last name シリウス (シリウス 
, Silius 
) , throughout the world, is a rare family name. The cognomen シリウス is habitual in Northern Europe, particularly Lithuania, where it is quite a rare surname, Finland, where it is a rare surname, and Latvia. Measured by absolute frequency, the name is most common in Lithuania, Finland, and the United States. Likewise, シリウス is the forename as well as the last name.