There are no languages that are derived from German. To answer your question, all of them. Actually English is more like German than anything else. It is a really messed up language for sure but I...
Most of the world languages are not derived from the German language. A few dialects in Europe, America, and Africa could be considered derivatives but there are no major languages that stem from...
A language referred to as "Indo-European" was the origin of the German language. In fact, most languages spoken in Europe and Asia come from Indo-European.