Change “Hey Siri” command

No. But if you don’t want to say “Hey Siri” just hold the SIDE button and speak your request.

Borrad123 Said:

"Change “Hey Siri” command: On iPhone 12 can I change the command “Hey Siri” to something else?"

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Changing "Hey Siri":

No, this is no an option (as of the date of this reply). But, you can, however, change the language on it: Change Siri voice or language - Apple Support

So, Recommend this to Apple:

Do Your Part: Let Apple know that you want this to be an option, and why. Apple won't get back to you directly, but the more feedback they receive on something, the more they will know what suits their custom's needs, and what to include in versions to come.

1. Go Here: Feedback - iPhone - Apple
2. Select: "Feature Request" for the "Feedback Type"
3. Comment: that you want this to be an option
4. Proceed from there as necessary

You’re welcome! Stay well.

You are welcome.