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Ancestor of Csernák family or some of them could be Ak-Had-Cher-a-yan-Na of whom Thrinákia ( Tsherayannaak ) later named Sikelia was named where thrák ( tsheraak ) nation in general - alternatively assignable as indians of Hadés/Dis - may have in antiquity come from.
Some of them obviously mished with slaves or went to the north and could have become what I mentioned above.
Icheri,itshkeri ,nákhadchui and wainák tribes also came from Sikelia through possibly Pannonia and are now called chechen and ingush in the Caucase.
Jews and christian tend to read these name as Khetsron son of Perets.
See Nyúl,Ingus,Székely,Öszödi, Leipziger and others !
Balázs Déri