Based on the search results, there is no information about the nationality of a person with the last name Czuba. The name Czuba is found predominantly in Europe, particularly in Eastern Europe and the West Slavic region, and is associated with Polish heritage. While some people on social media speculated that the assailant in a recent hate crime in Illinois, Joseph Czuba, was of Jewish descent due to his last name, there is no evidence to suggest that Czuba is a designated Jewish name. Therefore, it is not possible to determine the nationality of a person with the last name Czuba based on the available search results.