Meijer van Cleef was a son of Jacob van Cleef and Rose Wertheim. He married in Amsterdam on 22 February 1906 to Aaltje Pront, daughter of Leendert Pront and Elisabeth Arbeid. The couple had three children: Elisabeth, Rosa and Saartje.
City Archive of Amsterdam, archive card of Meijer van Cleef .
In addition, a Jokos file (number 51770) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.