I am searching for my mother's cousin Johanna Kowalska last in Poznan & a foster sister Maria Uśczyk last in Swientochlowitz. My mother's name is Maria Cichon,born in Swientochlowitz in 1937.
have you checked genealogy websites to see if others are looking for the same names.
as tlum explained... kowalski/a is a very popular name... rather like smith in the uk or robinson in the states.
i'd begin my search by looking for usćzyk or cichon
genealogy
ancestry
family search
jewishgen
nasza klasa
also... search facebook, etc.