I just tried it, it does not seem to be an option to utilize Postman to update the Client Name.
It shows that it works, this is the returned values:
{
"mac": "00:00:00:00:00:99",
"clientId": "1k1k1k1",
"name": "Test",
"devicePolicy": "Normal"
}
But when you do a get on the client, the description does not change.