Jacob ben Ephraim, Weyl - Donaueschingen is mentioned 2 times in 1710. His designation in the Stühlingen family tree is 'W2.2'. His father was Ephraim (Effermen), Weyl - Donaueschingen.
Jacob, a scion of the Donaueschingen Weyls is mentioned only in 1710. according to the records, he had left the parental house in 1709 [R9; 01.01.1710]. .