| Name |
Pronunciation |
Meaning |
English Spelling |
Gender |
| Sadb, Sadhbh | (syve) | "sweet" | | F |
| Sáerbrethach, Saoirbhreathach | (SEER-vra-hach) | "noble of judgement" | | M |
| Sáerlaith, Saorlaith, Saorla | (SEER-la) | "noble princess" | | F |
| Samradán, Samhradhán, Samhrán | (sow-RAWN) | "summery person" | | M |
| Samthann, Samhthann | (SAV-han) | | | F |
| Sanctán | (sank-TAWN) | Latin "sanctus," "a saint" | | M |
| Sárait, Saraid | (SAW-rit) | from sár, "best, noble" | | F |
| Sárán | (saw-RAWN) | chief, ruler | | M |
| Sárnat, Sárnait | (SAR-nit) | fem. form of Sárán | | F |
| Scandal, Scannal | (SKON-al) | "quarrel" | Scannell | M |
| Scandlach, Scannlach | (SKON-lach) | fem. form of Scandal | | F |
| Scandlán, Scannlán | (skon-LAWN) | dim. of Scandal | Scanlon, Scannláin | M |
| Scáthach | (SKAH-hach) | "shadowy" | | F |
| Sciath | (SKEE-a) | | | F |
| Scoithíne, Scoithín | (sku-HEEN) | "bloom, blossom" | | F |
| Scolaige, Scolaighe, Scolaí | (SKUL-ee) | "scholar" | Scully | M |
| Scoth | (SKUH) | "bloom, blossom" | | F |
| Scothnat, Scothnait | (SKU-nit) | "bloom, blossom" | | F |
| Scothniam, Scoithniamh | (SKUH-neev) | scoth "blossom" + niam "lustrous" | | F |
| Séafraid, Séafraidh, Séafra | (SHAY-fra) | gaelicization of Geoffrey | | M |
| Séamus, Séamas | (SHAY-mas) | borrowing of Jacobus | | M |
| Seaan, Seán | (SHAWN, SHANE) | from John | | M |
| Sechnall, Seachnall, Seachlann | (SAK-nal, SAK-lan) | borrowing of Secundinus | | M |
| Ségán, Séaghán | (SHEE-an) | "a hawk" | Sheehan | M |
| Ségdae, Séaghdha, Sé | (shay) | "hawk-like, fine, goodly" | Shea | M |
| Ségnat, Séaghnait, Séanait | (SAY-nit) | "a hawk" | | F |
| Séigíne, Séighín | (SAY-een, SAYN) | "a hawk" | Shine, Sheen | M/F |
| Selbach, Sealbhach | (SHAL-vach) | having great posessions | Shalvey | M |
| Senach, Seanach | (SHAN-ach) | sen, "ancient, old" | | M |
| Senán, Seanán | (san-AWN) | dim. of sen, "ancient, old" | Synan | M |
| Senchán, Seanchán | (shan-KAWN) | dim. of sen, "ancient, old" | | M |
| Serc, Searc | (sark) | "love, affection" | | F |
| Sétach, Séadach | (SAY-dach) | "having rich posessions" | | F |
| Sétna, Séadna | (SAY-na) | "traveller" | | M |
| Sibán, Siobhán | (shee-VAWN, sheea-VAWN) | borrowing of French Jehanne | | F |
| Sibéal, Isibéal | (se-BEL) | from Isabel, French form of Elizabeth | | F |
| Síle | (SHEE-la) | from Latin Caecilia | Sheila, Sheela, Shelagh | F |
| Sillán, Siollán | (sul-LAWN) | | | M |
| Sinéad | (shi-NADE) | from Janet | | F |
| Sítae, Síoda | (SHEE-dee) | perhaps "silk" | Sheedy | M |
| Síthmaith, Síodhmhaith, Síomha | (SEE-va) | from síth, "peace" | Seeva | F |
| Slébíne, Sléibhín | (sley-VEEN) | "mountainy man" | Slevin | M |
| Sláine | (SLAWN-ee) | | | F |
| Sochla | (SOCH-la) | "renowned" | | F |
| Solam, Solamh | (SO-lahv) | from Biblical Solomon | | M |
| Somhairle | (SOR-lee) | from Old Norse, "summer-farer, viking" | Sorley | M |
| Sorcha | (SUR-cha) | "bright, radiant" | | F |
| Stiamna, Stiamhna | (STEE-av-na) | from Biblibal "Stephen" | Sleyne | M |
| Suaibsech, Suaibhseach | (SUAV-sach) | "gracious, kindly | | M |
| Suanach | (SUAN-ach) | "drowsy" | | F |
| Suibne, Suibhne | (SUIV-nee, SWEE-ney) | | Sweeney | M |