
I name my dogs by using a "baby name book", for their pet names, there must be a similar book for german names. Most English books will give the origin of the name, as well as the variations. I call my dog Trefor, which is the correct way to spell Trevor. Trefor is Welsh in origin and there are no "v"s in Welsh.
For their pedigree names I pick a theme, usually flowers and trees. Wood Sage in German is called "Master of the Wood, which I think is apt for a gundog. Some years ago I remember "Doggie Hubbard" was selling books with names in for dogs in various languages, I bought the Russian edition for a friend with borzois.