Where does “Jihoslovan” come from?
Jihoslovan (Czech) comes from Czech Slovan, from Old Czech Slověnín, from Proto-Slavic slověninъ, from Proto-Slavic slovo, from Proto-Balto-Slavic ślawas, from Proto-Indo-European ḱléwos, from Proto-Indo-European ḱlew-, from Proto-Indo-European ḱel- — to cover; to incline.
Jihoslovan (Czech): South Slav
Ancestry of “Jihoslovan”, step by step