I found a Walter and Sophia Losiewicz from Poland in the 1920 and 1930 Federal census for the state of Illinois in the USA. Walter was born in c. 1897 and Sophia was born in 1900. They had two children, Thaddeus and Helen. After 1970 they changed the spelling to LASIEWICZ.
If you want more info let me know. I don't where in Poland they came from, just the descendants.