The Classical Latin pronunciation is /e.mi.ni/
The Italianate Ecclesiastical Latin pronunciation is /de.mi.ni/
In Modern English, both /dmna/ and /dmni/ are accepted pronunciations.
Personally, I go with the first English pronunciation, because it's the way I heard it being used.
The problem with the internet today is that it's filled with entire generations that did not grow up with the great wisdom of the Wyld Stallyns.