- U.S. pediatrician, born in Germany.
- German mathematician.
- U.S. physician (wife of Abraham Jacobi).
- Sir Derek (George). born 1938, British actor
- Karl Gustav Jacob (karl ˈɡʊstaf ˈjaːkɔp). 1804–51, German mathematician. Independently of N. H. Abel, he discovered elliptic functions (1829). He also made important contributions to the study of determinants and differential equations
