Column 4 reads: "Vejner Václav vlas[t]ně Wagner" which means "Vejner Václav, actually Wagner" - so I think Vejner is the surname that his father was using at some point. His father's father is Vagner. The likely reason is orthography - the letter "g" could be read as "j" (as in "yet") or as "g" (as in "get") before the 1840s orthography reforms, and "w" started to be written as "v".