Carpinus betulus
The name Karpenisi derives from the Aromanian word kárpinu (Carpinus betulus) + the ending -iş. The Greek spelling "Καρπενήσι" is influenced by folk etymology, the second combining form appearing to be "νησί" (island, pronounced [niˈsi]). The first mention of the name is traced back to an Ottoman tax ledger of 1454-1455.