I was raised in Oxford on Rideau Township (on O’Neill Road) and my family have been there since the early 1830’s.
My choice for the name should continue to be the South Branch, because that’s what it is. If we are going to use the term “creek” then it should also be named the North Augusta Creek, the Bishops Mills Creek, the Oxford Mills Creek, etc.. That body of water runs for many miles (or km) before it ever reaches the former boundaries of Kemptville. Thus, why call it the Kemptville Creek when, in fact, the total distance that it runs through Kemptville is probably about 1/20th of the distance of the total waterway.
Just my thoughts