Last name Serieux (Serieux 
) , all over the world, is a rare family name. The surname Serieux is habitual in Saint Lucia, where it is a common surname, Barbados, where it is quite a rare surname, and the Democratic Republic of the Congo, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Saint Lucia, the Democratic Republic of the Congo, and the United States. Likewise, Serieux is the forename as well as the last name.