The Slovenian phone site is listing a name Vojvoda, Vojvodic.
The Croatian phone site is listing Vojvoda and Vojvodic.
Do you have a name of a town for your ancestor?Without it you can do research in the "old country".
The www.google.comgives out 278 hits for Vojvod(a). The Social Security Death Index is listing 2 Louis Voivod? One of them your ancestor? One of them must be your ancestor since the years are same.Was there no mention of a town?Have you looked in a census for any further information? If he was naturalized citizen there should be some more info to go on. The LDS-Mormons have filmed the church records but you need to know a name of a town.