Władysław

This name was very common in 1900s Polish communities in America. It was widely Americanized into "Walter"— I'm guessing because the 'W', 'l/ł', and 't/d' are similar enough sounding consonants in the same order in both names, plus the 'a' sound in both is pretty similar if not the same. I've also seen it in the form "Ladislaus", though this was moreso an alternate rendering of "Władysław" for record-keeping, as opposed to actually being the name used day-to-day by Polish-Americans.