Sabada (Basque): Possibly “Sabbath.”
Safya (Moorish Arabic): “Pure,” from root safi.
Salimah (Judeo–Arabic): “To be safe.”
Salomia (Italian): Form of Salomé (peace).
Salwa (Moorish Arabic): “Consolation.”
Sama (Moorish Arabic): “She became honoured, exalted.”
Sancta (Italian and French): “Holy, sacred, divine, pious, consecrated, just.”
Santesa (Italian): This is still used in modern Sardinian.
Sapience (Flemish): “Wisdom,” from a French word with that meaning. The Italian form was Sapienza, and the Occitan form was Sebienda.
Satara (Moorish Arabic): “One who covers.”
Scarlata (Italian): The masculine form was Scarlatto.
Sedania (English): Form of Sidonia (from Sidon). In the Middle Ages, it became associated with the Greek word sindon (linen); i.e., the Shroud of Turin.
Servanda (Spanish): “To protect, save, preserve,” from Latin root servandus.
Sestrid (Swedish): Derived from Ancient Scandinavian name Ástríðr, with Old Norse roots áss (god) and fríðr (beautiful, belovèd). The familiar modern form is Astrid.
Setembrina (Italian): September.
Shifa (Arabic): “Remedy, cure, healing.”
Sibilia (Catalan, Occitan, Italian): “Female prophet, sibyl,” from Greek root sibylla.
Siggun (Swedish): Derived from Ancient Scandinavian name Siggunnr, with roots sigr (victory) and gunnr (fight, battle).
Sighni (Danish and Swedish): Derived from Old Norse name Signý (new victory), with roots sigr and ný.
Sireda (English): Possibly derived from Old Norse name Sigríðr (beautiful victory), with roots sigr and fríðr (beautiful, fair). It may also be a feminine form of Anglo–Saxon name Sigeræd, from Old English roots sige (victory) and ræd (counsel).
Smirenka (Russian and Slavic)
Solomonida (Russian and Slavic): “Peace,” from Hebrew root shalom.
Sosipatra (Russian and Slavic)
Spania (Occitan and Italian): Spain.
Sperança (Occitan): “Hope.”
Splendora (English): “Brilliance, lustre, brightness, distinction,” from Latin root splendor.
Sukayna (Moorish Arabic): “Cute, sprightly, adorable.”
Suna (Moorish Arabic): “Gold,” from a Persian word.
Sunnifa (Scandinavian): Derived from Old English name Sunngift (sun gift), from roots sunne and giefu. The modern form is Sunniva (Norwegian).
Sweetlove (English): From Old English roots swet (sweet) and lufu (love).
Sadoq (Judeo–Italian): “Righteous,” from Hebrew root tzadok.
Safwan (Moorish Arabic): “Rock.”
Salvi (Italian): “Unharmed, well, safe,” from Latin root salvus. This is still used in modern Catalan.
Santsol (Basque): Possibly “Saint Zoilus,” referring to a saint martyred in Córdoba. Its possible root is zoós (living, alive).
Saraceno (Italian): Saracen (i.e., a Muslim Arab).
Sebastie (Basque): Form of Sebastian (from Sebaste).
Sebbi (Danish): Nickname for Ancient Scandinavian name Sǽbiǫrn (sea bear), from roots sær and bjǫrn.
Selvi (Danish): Derived from Ancient Scandinavian name Sialfi, from Old Norse root sjalfi (himself).
Shorter (English): Exactly what it suggests. It was a nickname like Junior.
Sigfast (Swedish): Derived from Ancient Scandinavian name Sigfastr (fast victory), from Old Norse roots sigr (victory) and fastr (fast, firmly).
Slavogost (Slavic and Croatian): “Guest’s glory,” from roots slava (glory) and gost.
Snio (Danish): Derived from Old Norse name Snær (snow).
Sobeslav (Slavic): “Glory for oneself,” from roots sebe (for oneself) and slava. The modern form is Sobiesław (Polish).
Splinter (Dutch): Possibly related to modern Dutch word splinter (exactly what it means in English).
Stali (Danish), Stale (Swedish): Derived from Old Norse name Stáli (steel), from root stál.
Sture (Scandinavian): “To be contrary,” from Old Norse root stura.
Sulon (Breton): “Sun.”
Suni (Danish): “Son,” from Old Norse root sunr.
Svetoslav (Slavic): Hypothetical original form of Russian name Svyatopolk (blessèd people), from roots svetu (holy, blessèd) and pulku (people, army, host).
Svinimir (Slavic): Possibly from Proto–Slavic root svin’a (swine, pig) and Slavonic mir (world, peace). Others feel it’s an older form of Zvonimir (the sound of peace).
Syroslav (Slavic): Possibly from Proto–Slavic root širok (broad, wide) or Russian root syroy (raw), and Slavonic slav.