Yes, I know that in English Cape Verde is used most often. Wikipedia says:
Cape Verde [...] or Cabo Verde [...] (Portuguese: Cabo Verde, pronounced [ˈkabu ˈveɾdɨ]), officially the Republic of Cabo Verde
This is a country that has multiple spelling in different languages: Cap Vert (French), Kap Verde [German and Danish), Kapverdy (Slovakian), Zöld-foki Köztársaság (Hungarian), ...
So, I preferred to use its name in one of its two official languages Cabo Verde (Portuguese). In Cape Verdean Creole, the name is Kabu Verdi.