Surname San Gregorio (San Gregorio 
) , around the world, is a rare family name. The surname San Gregorio is characteristic of Philippines, where it is a rare surname, Argentina, where it is a very rare surname, and Spain. In absolute terms, it most frequently occurs in Philippines, Argentina, and Italy. Much less frequently, San Gregorio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| San Gregorio | Philippines, Spain, Argentina, Italy, Germany |
Aida, Amador, Carmen, Pacita, Ronald, Rowena, Dennis, Norwin, Noelia, Nelida, Evelyn, Franco, Isolde, Zulema, Xerxes, Maricel, Antonio, Amilius, Randell, Rachier, Rosadel, Roberto, Andrea, Shadel, Sharen, Mirian, Rosa, Rene, Jose, Joey, Marta, Mirta, Allan, Arnel, Cyril, Bryan, Rolando, Karen, Pablo, Pedro, Ruben, Doris, Gemma, Linda, Jerry, Julia, Norma, Irene, Paula, and Dolores