The name derives from skins imported from the Caucasus Mountains to Krynki for local tanners.
Bergman, Eleonora and Jan Jagelski, Zachowane synagogi i domy modlitwy w Polsce. Katalog. (Warsaw, 1996), p. 73 with ill.; Tomasz Wisniewski, Jewish Bialystok and Surroundings in Eastern Poland: A Guide for Yesterday and Today (Ipswich, Massachusetts, 1998), p. 85, ill. on p. 86; Przemysław Burchard, Pamiątki i zabytki kultury Żydowskiej w Polsce (Warszawa, 1990), p. 61; Rossiiskaia evreiskaia entsiklopediia (Moscow), vol. 5 - 2004, p. 221; Tomasz Wisniewski, Synagogues and Jewish Communities in the Bialystok Region: Jewish Life in Eastern Europe before 1939 = Bóżnice Białostocczyny: Hearthland of the Jewish Life - Synagogues and Jewish Communities in Białystok Region (Bialystok, 1992), p. 167, ill. on p. 168
https://jewish-heritage-europe.eu/2020/02/16/poland-synagogue-in-krynki-to-be-restored/