As far as I can tell, the PASDA networked streams dataset considers it to be the name of the tributary:
NAME: Trib 00808 To Darby Creek
It isn’t totally unheard of for names to have cryptic numbers in them, especially for obscure irrigation canals, peaks, bridges, on-ramps, and boundaries. It’s slightly more surprising here because the creeks are natural and run through a built-up area, but I guess either no one has managed to find out a more natural name for the creek or there was never an effort to name them all in the old days.
