Researching the derivations of Jewish names is a complicated task, and one that Benzion Kaganoff takes on with admirable results. He delves into the roots of names from Aaron (and its derivatives Agronsky, Arkin, and Orlik) to Zwirn (German for thread), finding biblical, occupational, and regional origins for nearly 4,000 names. Because Jewish names have been adapted and modified so often over the years, it"s all the more a triumph that Kaganoff has traced the history of so many common Jewish names and their offshoots.