Barop married Emilie Dorothea Froebel, daughter of Johann Christian Ludwig Froebel on 11 Jul 1831 at Keilhau. Emilie Dorothea Froebel was born on 11 Jul 1804 at Osterode and died on 18 Aug 1860 at Keilhau
Barop was a nephew of William Middendorf.
Source: Portrait of Johannes Arnold Barop, Director of the Kindergarten in Keilhau