Family name หล่อ (Lo 
, Cast 
, Castaing 
) , all over the world, is a widespread cognomen. The family name หล่อ is habitual in Hong Kong, where it is a prevalent surname, Macao, where it is a widespread surname, and Bermuda (explore the name in all countries). Measured by absolute frequency, the name is most common in Hong Kong, Senegal, and China. Much less frequently, หล่อ is the forename as well as the last name.