Try using Google Place Details API with the "reference" parameter returned by Google Place Auto Complete. This will return extensive information on your location query, including long and short names.
https://maps.googleapis.com/maps/api/place/details/json?reference=x&key=y&sensor=false
where x is the "reference" from your auto complete query, and y = your API key.
Here is the link for the Details API: https://developers.google.com/places/documentation/details#PlaceDetailsRequests