Jesko or Jesco is a male given name, which is used in Bosnia and Germany. It is a short form of Jaromir or Jaroslaw and may mean "the peacuful one", "the brave one", "the proud one" or "the soldierly one".
There may be a link with the name of polish ruler Mieszko I of Poland.
Like many traditional names ending with -ko such as Aiko, the name Jesko is somewhat associated with the gentry in Germany, but also used by other families. It is popular in the "von Puttkammer" family. Because it is an old name it is used in the more traditional minded population and is rare among the general population.
Famous people of that name include:
References
Jesko Wikipedia(Text) CC BY-SA