Cognomen קלאו (Cléo 
, קלאו 
) , worldwide, is a very rare family name. The family name קלאו is habitual in Belgium, where it is a rare surname, Israel, where it is a very rare surname, and France. Measured by absolute frequency, it is commonest in France, Belgium, and Brazil. Much more frequently, קלאו is the forename as well as the last name.