Surname San Martin (San Martin 
) , worldwide, is a common cognomen. The last name San Martin is habitual in Latin America and the Caribbean, particularly Chile, where it is a common surname, Argentina, where it is quite a common surname, and Uruguay. In absolute terms, the name is most common in Latin America and the Caribbean, particularly Chile, Argentina, and Mexico.
| VARIANT | COUNTRY |
|---|---|
| San Martin | Mexico, Argentina, Peru, Chile, Spain |