Throughout the world, San Mateo (San Mateo 
) is a very rare primarily male, but very seldom feminine forename. The forename San Mateo is characteristic of Latin America and the Caribbean, particularly Mexico, where it is an extremely rare male name. Much more prevalently, San Mateo is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| San Mateo | Saudi Arabia, United States, Indonesia, Spain, Philippines |
Jm, Gina, Lani, Lido, Lucy, Jose, John, Joan, Joel, Judy, Jill, Tess, Noel, Maria, Mario, Marta, Marco, Susan, Alvin, Allan, Alona, Aljon, Gema, Dian, Ryan, Rudy, Meg, Bea, Ron, Rex, Lea, Luz, Joy, Val, Mark, Mila, Ariel, Mike, Myla, Alex, Anna, Armi, Amie, Aida, Kara, Raul, Rita, Ruth, Myra, and Arnel