To set a voice shortcut for Siri, go to the Settings app, select Accessibility, and scroll down to Voice Shortcut. Select “Set voice shortcuts,” then select “Siri” and enter the wake word you want, such as “Computer.”
Once set, this new name will enable Siri. However, please note that this setting does not sync with other devices; The tablet will still have the same “Hey Siri” statement.
In addition to setting up Siri, Voice Shortcuts also let you use voice commands to launch apps and access system functions like taking a screenshot, adjusting the volume, and activating Control Center.
Source: Ferra

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