Cyril Joseph Denneny (December 23, 1891 – September 10, 1970) was a Canadian professional ice hockey forward who played for the Ottawa Senators and Boston Bruins in the National Hockey League and the Toronto Blueshirts of the National Hockey Association. His brother Corbett Denneny also played in the NHL.Cy Denneny was born in Farran's Point, Ontario, near Cornwall. He was the son of James Israel Denneny who was a top lacrosse player in the late 19th century and was descended from the Dennenys of County Monaghan, Ireland. Wikipedia