LAMB:
(1) (British). Possibly a modern form of the ancient Irish name "O'Luane". Name taking - or based on - the first name of the ancestor's father (patronymic).
(2) (British). "Lamb, from tending lambs". Name reflecting the occupation or status of the ancestor.
The above information taken from: Family Chronicle - Surname Origin List Note: The above depicted Coat of Arms does not necessarily reflict this surname's ancestry.