foaf:familyName statt foaf:lastName

Angeblich ist foaf:familyName bevorzugt. Passt auch besser zu unserer
Intention und zur Verwendung neben givenName. Zu foaf:lastName: „The
lastName property is provided (alongside firstName) as a mechanism to
support legacy data that cannot be easily interpreted in terms of the
(otherwise preferred) familyName and givenName properties.“