Surname מסרו (Macero 
, מסרו 
) , throughout the world, is quite a rare cognomen. The last name מסרו is habitual in Venezuela, where it is quite a rare surname, Philippines, where it is a rare surname, and Argentina. Measured by absolute frequency, it is commonest in Venezuela, Philippines, and the United States. Very seldom, מסרו is the forename as well as the last name.