Surname San Antonio (San Antonio 
) , worldwide, is quite a common cognomen. The last name San Antonio is habitual in Aland Islands, where it is quite a common surname, Philippines, where it is quite a rare surname, and Puerto Rico. Not in comparison with a country's population, it is commonest in Philippines, Mexico, and Guatemala. Much less frequently, San Antonio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| San Antonio | Philippines, Spain, United States, Mexico, Guatemala |