Oh, that's weird. I've always pronounced Emmerich "E-me-rikh," which is the pronunciation that BtN gives. I'm not doubting you or creating an argument or anything. That's just how I've always pronounced Emmerich. Emeric just looks unfinished to me, but no biggie.
I'm confused about it too, and normally I might agree with you about Emeric. But I associate it with Alaric in my head so I see it differently (if that makes sense!).