Unable to find Bluetooth device

You may try to enable the active flag of NRF.findDevices/setScan just in case. This does active scan i.e. requests from each device so called scan response with additional data. That could help if the name itself was not in advertisement packet but in scan response packet (possibly because advertisement packet is full of some other more important data). See more details about scan response here http://www.espruino.com/Reference#l_NRF_setScan

I don't see such flag described e.g. here https://developer.mozilla.org/en-US/docs/Web/API/Bluetooth/requestDevice so maybe doing active scan is default on other devices.

EDIT: yes looks like default is active scan in web bluetooth see https://webbluetoothcg.github.io/web-bluetooth/scanning.html#scanning

6 . Let scan be a new BluetoothLEScan instance whose fields are initialized as in the following table:
..
active true