The latest update to Google Maps for Android give you a greater ability to customize your surroundings. You can name an unidentified spot on a map such as a particularly good spot for sledding in your neighborhood park. In addition, you can edit places that already have a name.
To give a unnamed spot a name, search for an address or drop a pin on the map. Tap the pin, then tap the triple-dot button in the upper-right corner and select Edit name. Your place will now have a name on your map -- and only your map; the name is private and visible -- and searchable -- only to you.
You can also use the same Edit name button for places with existing names. Your custom name will push the official name of the place to parenthesis.
You can delete or further edit your privately named places by tapping the hamburger button in the upper-left corner of Google Maps and selecting Your Places, where you'll see a list of your named places.
Elsewhere in Google Maps, you can learn how to stop Google from tracking you with the new Your Timeline feature.