https://techcrunch.com/2017/10/04/google-assistant-now-has-a-male-voice-option/

Google Assistant is adding a little dimensionality to its voice characterization: The virtual AI companion got an update that adds a voice option called “Voice II” which sounds decidedly male (via Engadget). The  second voice option is available in Assistant’s settings (not yet live for all, so your mileage may vary) and applies to the Home app as well as to your phone’s assistant.