| Sonya | | SON-yə (English), SAWN-yə (English) | Russian, English | |
| Sophia | | so-FEE-ə (English), so-FIE-ə (British English), zo-FEE-ah (German) | English, Greek, German, Ancient Greek | |
| Sophie | | so-FEE (French), SO-fee (English), ZO-fee (German) | French, English, German, Dutch | |
| Sophy | | SO-fee | English (Rare) | |
| Sorrel | | SAWR-əl | English (Rare) | |
| Sparrow | | SPAR-o | English (Rare) | |
| Spencer | | SPEN-sər | English | |
| Spike | | SPIEK | English (Rare) | |
| Spirit | | SPIR-it | English (Rare) | |
| Spring | | SPRING | English | |
| Stace | | - | Medieval English | |
| Stacee | | STAY-see | English (Rare) | |
| Stacey | | STAY-see | English | |
| Staci | | STAY-see | English | |
| Stacia | | - | English | |