Herbert Loeb was a son of Ernst Loeb from Düren and Jenny Rose from Dortmund. He married Esperance Nanette Leefsma in Amsterdam on 3 June 1942, a daughter of Louis Leefsma (alreday deceased in 1932) and Rozette Elzas.
City Archive of Amsterdam, archive cards of Herbert Loeb and Esperance Nanette Leefsma.