According to Memory Alpha, James Blish's novelization of the ep in Star Trek 6 was titled "The Cloud Miners". I don't remember having noticed that at the time, but the book I had in the early 1970s is long gone and so are bits of memory which may have contained that detail.1) "Cloud Miners" here, too. And as a title it DOES work. The miners mine for who? The CLOUD people. In fact, I think it's a better title than the weak "Cloud Minders".
I always thought it meant the miners toiled for the city dwellers' lifestyle in the clouds. Similar idea.