It's easy to imagine that Naqādah the place was named by the Goa'uld because it had something to do with Naquadah processing or experiments. The expository dial

It's easy to imagine that Naqādah the place was named by the Goa'uld because it had something to do with Naquadah processing or experiments. The expository dialogue writes itself there. Kelowna is more of a stretch, but I'm betting that someone in the writers' room said "Hey, we already had a Salish episode; if anyone asks, we could just say that some native spirits influenced the names on both planets!" Apparently those people actually were the first inhabitants of that area. So all they'd need to do is connect them to Langara!