Olavi on Family Tree Circles

These are all the names my GM has been known by, first her birth name and then all the married names. I cannot find anything about my paternal grandparents. There were Roumanian. My father was born in Dahinda, Sask in 1916 and was the youngest. His birth father was Constantine COJOCARIU (aka) COJOCARI and his mother was Cleonfira CRACIUN (aka Dora). His birth father died when he was 4 years old and GM married George LENCHUCK which then became my father's surname for all of his life. His sisters and brothers were Jennie, Angeline, Jim, Bill, Steve and George. Some used LENCHUCK and some used COJOCARI and alternated back and forth. The married surnames for his sisters were LEONARD-Jennie married Gabe or Gabriel and Angeline married Art OVERHOLT. Hamilton and Niagara Falls Ontario is where the family ended up. Any help would be very much appreciated.