Apple already knows those in your network and has for years. If you have an iPhone open the camera app and look under "People & Pets."

You have to specifically identify and name the people in the photos, otherwise all it knows is that it's a person and throws it into that folder. And if you don't use icloud none of it leaves your device. It does the photo processing locally on the phone. It only knows what you tell it.

https://support.apple.com/en-ca/108795

https://applemagazine.com/find-people-and-pets-in-photos/