Cognomen Bastum (Basto 
, Bastun 
, Bastum 
) , all over the world, is a common last name. The last name Bastum is characteristic of Portugal, where it is quite a common surname, Colombia, and Belize. Not in comparison with a country's population, it is the most numerous in Latin America and the Caribbean, particularly Colombia, Mexico, and Brazil. Much less frequently, Bastum is the forename as well as the last name.