Silvester (secural name Ivan Kharun, 1914–2000) – an Archbishop of the Orthodox church in Amerika. >>

Pavel Sinaisky (1860–?) – an arrchpriest. >>

Vasily Sinaysky (1947) –  a famous conductor. >>

Vasily Sinaisky (1876–1949) – professor of  the  University of Latvia  from 1922 to 1944, where he read lectures on Civil law.   >>

Natalia Sinaysky (1914-2006) – a daughter of Professor Sinaysky. Worked as  specialisit in the fields of customs and tax law in the institutions of the European  Economic Community. >>

Alexander Sirotin (1883-?) –  a member of the People's Council of Latvia in 1919-1920, public figure, master ceramist. >>

Marina Sizova (1925–1988) – a ballerina, classical dance teacher. From 1945 to 1965, she was a soloist with the Latvian Ballet. >>

Polina Sjakste (1929–2019) – a Docent of the Riga Medical Institute, from 1990 – Latvian Medical Academy. >>

Tatjana Sjakste (1953-2016) – Doctor of Biology (Dr. biol.), leading researcher at the Institute of Biology of the University of Latvia. >>

Nikolay Skachkov (1948) – Doctor of Emgineerig (Dr. sc. ing.), lecturer of the Riga Polytechnic Institute. >>