2,150,000 chess960 180,000 "chess 960" 30,800 chess frc 23,500 "Fischer Random" Chess 24,600 Fischerrandom Chess 18,400 Fischerandom Chess 9,900 "Shuffle Chess"
Somewhat curiously, the number of 'chess960' pages and the number of 'Fischer Random Chess' page have decreased by half, while the other terms show increases. I'll chalk that up to Google anomalies.
The term 'chess960' still wins by a landslide. Chess960 @ Wikipedia is the first result returned, while this blog is around no.20.