I see that it's been a couple of years since this post, but perhaps someone will still be looking... In searching for my family I have come across a great variety of spellings of the name within just two generations. Among them are; Vukajanec, Vukojanec, Wukojanec, Vokojenc, Vukojanc, Ukojanc, Ukayance, Ukajanc, Vorgethanz, Vokien, Wokojanz, Wokojanc, etc... My name is Wokojance, which is the name of about 50 persons in the U.S., all coming from Johann, whose family was from Zuzemberk, Slovenia and who emmigrated in 1899. It looks likely that Vucajnk could be of the same family line as my own. Looking forward to making a possible connection.