This is interesting...
"...A word about his marriage and descendants may be
quoted here. Barnato met his future wife at Kimberley
in 1874, and in 1875 they were secretly married by the
civil law. Mrs. Barnato was not a Jewess, and the
marriage was certain to be bitterly opposed by the
family. She was a most able, accomplished woman,
and adopted the Hebrew faith, in which the children of
course are brought up. The eldest, Leah Primrose,
born in 1893, was named after his mother, and his first
mining venture ; Isaac Henry, and Woolf Joel Barnato
are the younger children."
https://trove.nla.gov.au/newspaper/article/121635356