Tp put it in simple terms

jakob Klaasen (s0n of Klaas) Goris (as decreed by Napolean, i.e. get a name
Klaas (son of Jacob) Jacobs
Geertje Harms (daughter of harmen)
Harmen Alberts...........Harmen (son of Albert)


Jakob Klaasen Goris m. Jantje Cornellis
(father)Klaas Jacobs m. Geertje Harms Goris - At this point Jacobs takes the Goris name - I would like to know why
(Geertje's parents)Harmen Alberts Goris m. Antje Willems