I say that the neighborhood to the west of Rancho Rinconda is Wilson Park.
https://nextdoor.com/neighborhood/wilsonparkcup--cupertino--ca/

Further west, it's probably City Center.
The authoritative one from Cupertino doesn't officially recognize an HOA for Wilson Park.
https://gis-cupertino.opendata.arcgis.com/maps/Cupertino::neighborhoods-home-owner-associations.