Cognomen Calixtus (Calixtus 
, Калікст 
) , across the world, is a very rare family name. The last name Calixtus is habitual in Malaysia, where it is a rare surname, Nigeria, where it is a very rare surname, and the United States, where it is an extremely rare surname. Likewise, Calixtus is the forename as well as the last name.