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It appears that the author(s) of this article are under the misimpression that Boniface is the surname of this family.
Their family name was "de Castellane" and "Boniface" was just one of this individual's given names.
I propose to correct the error here, in the article on his wife Anna Gould (especially for the children, all erroneously given the surname "Boniface" there) and other places it might have crept in.