Hercynian is a lostlang project by Jörg Rhiemeier that is currently under preparation. Hercynian is a branch of Hesperic closely associated with Alpianic, consisting of a few languages spoken in Germany. It is not determined yet how many languages there will be and in which locations they are spoken. Currently, Proto-Hercynian is under construction.
The name "Hercynian" stems from Ancient Greek geography where it denotes the then heavily forested and inaccessible Central European hill landscape; it is today sometimes used in geography and biology in reference to this region.