A hereditary name common to all members of a family, as distinct from a given name or forename. Where (for a double barrelled or two word name) the delimitation between surname and forename is not clear, name variations may be supplied with the different delimitations. Eg 'Tom Parker Bowles' could be handled as 'Parker Bowles, Tom' and as 'Bowles, Tom Parker' using different PersonNameAlias objects for the same person.