Where does “hiilihappoinen” come from?

hiilihappoinen (Finnish) comes from Finnish hiilihappo, from Finnish happo, from Russian Агапий, from Old East Slavic Ага́пии, from Old Church Slavonic Ага́пии, from Ancient Greek Ᾰ̓γᾰ́πῐος, from Ancient Greek ἀγαπάω — to show affection for the dead; to treat with...

hiilihappoinen (Finnish): carbonated, containing carbonic acid