HOW DOES AN EASTERN RUSSIAN PALE FAMILY ACQUIRE A RARE POLISH NAME ENDING IN [O]
as I have stated both Duro and Dyro names are probably of Belarusian origin (one could perhaps arise as a surname in Ukraine rather than present day Belarusia but this is just my theory) - Polish ethnicity arised on the border zone between Lithuanian and Belarusian national areas in the course of 17th and 18th (perhaps into the 19th) centuries - it was mostly the native people of the land (either Lithuanian or Belarusian) who accepted the Polish language and identity mainly because Polish became the best means of the communication in this border zone - the local nobility (most of them were petty nobility) were the avantgarde of the changes - perhaps there was some minor influx of Polish nationals from the lands of Polish Crown - a strong Jesuit presence may have significantly influenced the process (they have almost monopolised education in many areas promoting Polish language and catholicism in areas were orthodox church was once dominant though you have to keep in mind education was rather exclusively the privilege of the nobility - though sometimes their material status did not have much significance)
I don't believe Emilia Szypko was of pure Jewish ancestry - but she could have been of mixed ancestry - I wouldn't associate surname Szypko to Jewish ancestry - so if she was of mixed ancestry her mother must have been Jewish - this actually goes well along the lines how Jews traditionally view their ancestry - you're Jewish if your mother is Jewish - the Jewish mother of Emilia (if she really was Jewish) could have converted to catholicism on marrying her husband - there were instances of mixed Polish-Jewish marriages in the area historically but I am unaware of how common they were