Does anyone have any idea where the last name Rischak originates from? An ancestor of mine who lived in Germany had it but I’m pretty sure it’s of Eastern European origin. Does anyone know where in Eastern Europe it could be from?

I know I have both Norwegian and Swedish ancestors and for the last few months I’ve been doing some research into finding out who they are. Because I’m from the US and most of the documents and databases are in their home language, I am finding it difficult to know exactly what I should be searching for and where. Does anyone know how to find Norwegian and Swedish data online? Or if there’s an easy way to find translated info?