Siegfried Goudeket was one of the first Jewish boys who was picked up during a raid in Amsterdam. Siegfried was murdered in Buchenwald. After an intensive correspondence with the German authorities, Isaac Goudeket could place the ashes of Siegfried in crematorium Westerveld.
A part of this correspondence one can find in part 1 of J. Presser Ondergang: de vervolging en verdelging van het Nederlandse Jodendom 1940-1945 (Uitgeverij Aspekt, 1965) p. 90-91.
Presumable this person is commemorated on a memorial in Vierhouten. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.