Rare last name belonging to my Grand Uncle. His daughter stated he came from Russia and I've found him on passenger lists in 1913. It states he came from Soroky, Russia. Googling the name (and city) and searches in ancestry websites have not produced anyone else with the name, nor any information on the name or city. Given name Lukasz. Canadian border crossing states Pokatovich, perhaps by border clerk misinterpretation.
Looking for where this last name originated. Any help would be appreciated.