What was the unofficial name for Germany between 1919 and 1933?

The unofficial name for Germany between 1919 and 1933 was the Weimar Republic. It is called so because the government was established in the city of Weimar due to political unrest and violence in Berlin after World War I. The name "Weimar Republic" represents a period of significant social, political, and cultural changes in Germany as the country transitioned from a monarchy to a parliamentary democracy.