An Etymological Dictionary of the German Language/Annotated/Lamm
Lamm, neuter, ‘lamb,’ from the equivalent Middle High German lamp (plural lember), Old High German lamb (plural lęmbir), neuter. It corresponds to Gothic lamb, Anglo-Saxon lomb, English lamb, Dutch lam, ‘lamb’; a primary Teutonic term which passed also into Finnish (lammas, genitive lampaan). Cognates in the non-Teutonic languages have not yet been found.