Jureša is Slovak as well as you can see at
http://infobel.com/en/world/Teldir.aspx?Ct=Europe&Co=Slovak%20Republic&Dn=Telef%F3nny%20Zoznam%20SR&url=http://www.zoznamst.sk/eng/index.html. It can't be Hungarian since doesn't exist in that language. It's simply a pet form of Jur- 'George' (Russian Yuri, Polish Jerzy, Czech Jiří, etc.).