@carola.b
Correct surname: LEUIKEN
https://www.joodsmonument.nl/en/page/169891/simon-leuiken
Simon Leuiken (1899 - 1945) - Genealogy
https://archief.amsterdam/indexen/deeds/98533421-8cd2-56a3-e053-b784100ade19?person=98533421-8cd3-56a3-e053-b784100ade19
https://www.oorlogsbronnen.nl/tijdlijn/Simon-Leuiken/02/92097
https://totenbuch.buchenwald.de/names/details/person/28072/ref/recherche