They don't seem to be an ethnic group so much as a marginalized social class, but some have suggested a connection with the word "Hebrew."

他们并不像是少数民族,而更像是边缘化的社会阶级，但有些人指出它与希伯来这个词有关联“

耶鲁公开课 - 旧约导论课程节选

And you can contact me if you have some questions in connection with the material.

你能联系我,如果你对这个材料,有问题的话。

麻省理工公开课 - 固态化学导论课程节选