Isac (Isak) ben Salomon, Bloch is mentioned 6 times between 1721 and 1732. His designation in the Stühlingen family tree is 'C2.1.4.2.1'. His father was Salomon (Rabbi), Bloch.
No current records exist, but on page 176 of Berthold Rosenthal`s Heimatgeschichte a plea of rabbi Salomon to the authorities is mentioned to grant protection to his son Isak. .