[quote=@UltikanaRe]
<Snipped quote by Xilaw>

I mean, in the story, instead of Graf could they be Viscount, Baron, etc.?  Not just for how they are written, I mean can I use those ranks as a replacement.
[/quote]
Sure. As long as it's not higher than the title of duke or count. Baron is also an English title (counterpart to German Herr) so it's acceptable. Viscount, too, was used in England and is equal to German Burgrave. Both titles you mentioned are available already.