Lazarus Siemons was a son of Siemon Siemons and Rebecka Koopman. He was a shoemaker. He was married to Bertha Kamp. The couple lived in the Javalaan 8 in Hilversum. On 6 May 1943, Lazarus Siemons died in Vught concentration camp.
Records concentration camp Vught, Sterbebuch 1943