| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Socorro | - | Spanish | ||
| SofÍA | so-FEE-ah | Spanish | ||
| Sofronio | - | Spanish | ||
| Sol (1) | - | Spanish, Portuguese | ||
| Soledad | so-le-DHAHD | Spanish | ||
| Sonia | SON-yə (English), SAWN-yə (English), SO-nyah (Italian) | English, Italian, Spanish, Portuguese, Romanian | ||
| Soraya | - | Persian, Spanish, French | ||
| Sosimo | so-SEE-mo | Spanish | ||
| Susana | soo-SAH-nah (Spanish) | Spanish, Portuguese | ||
| Susanita | soo-sah-NEE-tah | Spanish | ||
| Tacito | tah-CHEE-to (Italian), tah-THEE-to (Spanish), tah-SEE-to (Latin American Spanish) | Italian, Spanish, Portuguese | ||
| Tadeo | tah-DE-o | Spanish | ||
| Tancredo | - | Spanish | ||
| Tatiana | tah-TYAH-nah (Russian, Polish, Spanish, Italian), TAH-tee-ah-nah (Finnish), ta-tee-AN-ə (English), ta-TYAN-ə (English) | Russian, Slovak, Bulgarian, Romanian, Polish, Greek, Georgian, Spanish, Portuguese, Italian, Finnish | ||
| TeÓDulo | te-O-dhoo-lo | Spanish |