sermani
map of Hungary of old
http://users.erols.com/mwhite28/austhung.htm where 12 different languages were spoken.
What was language of your ancestor? The 1930 census should have a notation Na-naturalized; Al-alien or Pa-first paper.
If your ancestor was naturalized citizen than his naturalization intent and petition will have a place of birth. You might try to locate his arrival manifest, church marriage record.
Look also for JUHAS, JUHASZ spelling.
www.surnamenavigator.orgwww.radixforum.com