As someone in Pakistan, I can tell you that it is a term but doesn't necessarily need to have been documented. If someone does something as a trade, you append

As someone in Pakistan, I can tell you that it is a term but doesn't necessarily need to have been documented. If someone does something as a trade, you append -waala to their trade and call them by that. So, if you see someone driving a tuk-tuk, or rickshaw as they're known in Pakistan, you refer to the driver as a rickshaw-waala. A chai seller becomes a chai-waala, a fruit seller becomes a fruit-waala, and so on.