Schlesien

Etymology

 * Possibly related to the  tribe, whose name derives from, itself possibly from  for "swampy place."
 * Or, from, , themselves cognate with the same Silesian source and meaning "dampness, humidity, moisture." More at Ślęża and Silesia.

The name occurs at least since the 16th century, where it's also, from , earlier.

In the 16th century, the name of this region also occurs as as in Sebastian Münster's Cosmographia (which has Presla and later Preßla for the capital ) and as, this from ,.