Yeah, be careful not to confuse American "English" with proper...
IMO it doesn't much matter how it sounds so long as you're understood. A lot of the names have been around a long time but few languages have not evolved over the last few hundred years (but don't shoot me, I'm no linguist
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I've always said Beetlejuice, that's just me. Again just IMO there's not much worse than trying to enrich the general populous with an interesting subject and putting them right off with names they can't reproduce...