When first setting up your player you will be given an option to give your player a Room Name which is the name your player will display as in the BluOS app.
To change this name after the initial setup first select the player you would like to rename from your Player Drawer, then open the Navigation Drawer by selecting the 3 lines in the top left corner of the BluOS app. From here go to Settings > Player > Room Name and input the name you would like to give to your currently selected player.
If you are using Amazon Alexa with your BluOS players, it is recommended to use a name familiar to Amazon Alexa. For a list of these names and additional information regarding setting up Alexa with your BluOS players, please see the article below.