Izak Bloemendal was a son of Philippus Bloemendal and Betje Polak. He married in Amsterdam on 29 November 1922 to Flora Batavier, daughter of Jacob Emanuel Batavier and Frederika Konijn.
website www.wiewaswwie.nl.
Izak Bloemendal is mentioned in the diary which was kept by Ernest Ruschkewitz during his inprisonment in various concentration camps. The diary is saved and held in the archives of the Jewish Community of Würzburg in Germany. Fragments of this diary are to read (in the dutch language) on the website Tweede Wereldoorlogervaringen van de familie Ruschkewitz.