The voice activation command/invocation name is the name of the Voice App. The voice activation command is the voice command that allows the users to interact with the voice app, for example, to open and listen to the content of the voice app.
The invocation name can be changed at any time while developing a voice app but it is not possible to change the invocation name after a voice app is certified and published.
Users say a skill’s invocation name to begin an interaction with a particular custom skill.
For example, if the invocation name is Daily Horoscopes, users can say “Alexa, open Daily Horoscopes”.