Why does a "SAMSUNG_Android" network service keep appearing?
This looks like someone near you has a Samsung Android device with the ability to create a personal WiFi hotspot.

Your computer WiFi is able to detect this so will add it to your list of available networks. You might try disabling the prompt to join new networks if you don't want your Mac polling for open and closed hotspots and cluttering up your network connection profile if you cannot isolate or control for the source of this hotspot.