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Hi - Thanks for checking. It would be great to know what is the requirement to return a random ThingName. A thing is a representation of a specific device or logical entity. It can be a physical device or sensor (for example, a light bulb or a switch on a wall). It can also be a logical entity like an instance of an application or physical entity that does not connect to AWS IoT but is related to other devices that do (for example, a car that has engine sensors or a control panel). The solution should enable each device (or Thing) to have a unique name (or ThingName) in the device registry and identified of what they are. So giving a proper name, or serial number or other identifier based on your organization is a best practice.
The thingName is a required attribute which needs to be provided and you can't change a thing's name after you create it. To change a thing's name, you must create a new thing, give it the new name, and then delete the old thing.