Rochelle was a fruit variety grown on the Knox farm (the family for whom Knoxville is named); it was either a grape or a blackberry.
“Community to observe ‘Know Knoxville Week.’” Pittsburgh Press, Apr. 15, 1934, p. 12. Newspapers.com 142935429.
Regan, Bob. The Names of Pittsburgh: How the city, neighborhoods, streets, parks and more got their names. The Local History Company, Pittsburgh, 2009, p. 72. ISBN 978-0-9770429-7-5.