Lamb, Lambe An English surname from a nickname for the animal (meaning a meek and inoffensive person), or a shortened form of Lambert. In 1890 the surname was principally found in Dublin, and the estimated number of bearers was 2,240 (including variants). In the United States Lamb is the 477th most numerous surname with an estimated 66,000 bearers. In England and Wales in 1996 it was the 309th most numerous surname.