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Amazon's Alexa can recognize the voices of multiple users

To set up your own voice profile, you'll need to go through the Amazon app. You'll go to your account settings and tap Your Voice, then tap on your profile name. If you want to place calls or send messages to your contacts, you'll have to give the app permission to upload those contacts to the Amazon service, and then you'll need to say several phrases out loud. (If you're already set up voice calls and messages, you won't need to do this again.) If you want to add other people to the same device, you'll need to have them sign into their own account via their own Alexa app, or they can choose the "I'm someone else" option on your mobile Alexa app, then train their voice on the device in the same way.