At first a device is called what the phone calls itself (for example, “Redmi 15”). You can change it any time: “Home” → “Devices” → the pencil next to the name. Every adult in the family sees the new name. On the website there is the same pencil in the “Devices” list.
Rename a device
Installing, your family, your first child and their device — about 10 minutes. For the adult and the child