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My guess is that Wladzia is short from Wlodzislawa (or from any other name that starts with Wlod - to rule). Similarly, Bronia can be short from Bronislawa or any other name that starts with Bron - protection. I honestly have no idea about Marysia, though you could be right about Maria. For more ideas check the polish names page
http://www.behindthename.com/nmc/pol.html