Hello and thank you for your help. I have since learned that John/Ivan Berkovich arrived at Ellis Island with his mother Kate on 4 Jul 1908
Port of Departure: Havre
Race­: Dalmatian
Ship Name: La Touraine
Former Residence: Starigrad
Next of kin: father Nicola BOGDANOVIC

So they were from Dalmatia. The previous Janos Berkovich that I found was from Hervathnenzina was not the right one!