I typed in Kniazew and this is what I got. My grandparents were Russian/ German, but not sure what area they came from. They're family name could have come from Poland... any thoughts?
Families belonging to the coat of arms: Kniaziewicz, Kniażewicz, Ostojczyk
Families belonging to the coat of arms: Brasewicz, Dyniatyński, Kagiel, Karwat, Kimborowicz, Kniażewski, Kogiel, Kowalski, Kozakiewicz, Lubecki, Mikołajewicz, Młodawski, Młodowski, Mordasewicz, Murdelio, narwhal, Piotrowicz, Snacks, Snarski, Wizgird, Włodawskie, Zilina