try listening to different voices pronouncing the variations you have found. http://ivona.com
Could Slovak spelling ŠVAJDLENKA be close to the spelling you have on the document?
In 1995 in Lab there was a S^VAJDLENKOVA.
Presently in Lab's phone book as well. http://telefonny.zoznam.sk/svajdlenka/lab/
to see if some of the variations do show up in Poland. You do need to use a wild card " % or * " for the special character letter in Polish alphabet.