Where does “muinaiskirkkoslaavi” come from?
muinaiskirkkoslaavi (Finnish) comes from Finnish kirkkoslaavi, from Finnish slaavi, from Medieval Latin sclavus, from Ancient Greek Σκλάβος, from Ancient Greek Σκλαβηνός, from Proto-Slavic slověninъ, from Proto-Slavic slovo, from Proto-Balto-Slavic ślawas — to cover; to incline.
muinaiskirkkoslaavi (Finnish): Old Church Slavonic
Ancestry of “muinaiskirkkoslaavi”, step by step