An Etymological Dictionary of the German Language/Lamm
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Lamm, n., ‘lamb,’ from the equiv. MidHG. lamp (plur. lember), OHG. lamb (plur. lęmbir), n. It corresponds to Goth. lamb, AS. lomb, E. lamb, Du. lam, ‘lamb’; a prim. Teut. term which passed also into Finn. (lammas, gen. lampaan). Cognates in the non-Teut. languages have not yet been found.