This book analyzes the reasons for the emergence and extinction of the Croatian name in four Slovene border regions. The author uses comparative methods and a broad spectrum of sources. In the early Modern Age, the Croatian name established itself in these areas as a temporary phenomenon, replacing the original Slovene name, which at that time had a «pre-national» content and was also used by a considerable portion of today's Croats. Extending the use of the Croatian name to the Slovene border regions was a component of a broader and long-term process. The author explores how this process was triggered by tectonic geopolitical changes resulting from the Ottoman conquests in the Balkans and the Pannonian Basin.