Etymology of placename Ugorsko is:
U - goru - sko , meaning In - the - hill , U=In , Gora = Hill, Mountain ---> the starting point from where you ascend into the hills.
"Sko" is a posessive suffix to adjective.
However, although there are no toponyms in Bosnia-Herzegovina that refer to Hungary as in Ugarska, Uhersko, Ugri, Uhry, Wengry, etc. - there is a significant number of toponyms (villages, and other placenames) named Mađari (Magyari), reffering to places whose inhabitants derive or come from Hungary, possibly the XVII-XVIII. c. refugees from ottoman Hungary.
There is also a significant number of Bosniak-muslim surnames that refer to Hungary, such as :
Mađarević (Magyarevics) - from Hungary (Mađarska-Magyarorszag)
Budimlić, Budimlija (from Buda - Budim)
Peštek, Peštalić (from Pest)
Udžvarlić (from Ujvar)
Kanižlić (from Kanyizsa)
Jegirlić, Egrlić (from Eger)
etc.
Surnames that end on -aš (-as) suffix among bosnian muslims are probably of hungarian descent.
Also, an old Bosnian word for land or country is "rusag" (ruszag) , which derives from hungarian "orszag".

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