Donna, I would not take the spelling of a surname on an US census to the bank. I did see a notation Na-naturalized by his name. Have you his naturalization intent & petition? How about his arrival manifest, church marriage record. I would think the church baptismal record might have a correct old country spelling.
Hopefully you listed to the pronunciation of the surname in http://ivona.com
Check out http://www.bing.com/translator
for translation or double check against the www.translate.google.com
side note: did leave you a message on Michal TUDOR. I was hoping to see the naturalization papers that you received to make sure we are talking about the same thing. Thank you.