Many of the historical names of Apache groups that were recorded by non-Apache are difficult to match to modern-day tribes or their subgroups. Over the centuries, many Spanish, French and English-speaking authors did not differentiate between Apache and other semi-nomadic non-Apache peoples who might pass through the same area. Most commonly, Europeans learned to identify the tribes by translating their exonym, what another group whom the Europeans encountered first called the Apache peoples. Europeans often did not learn what the peoples called themselves, their .