I was still looking on for a solution - but in the moment there is non.
I found out it depends on the epub-system for the metadata. more than 25 years ago they have decided to standarise the metadatas based on the "Dublin Core"-system and there the field for the author is only one !! field like this for the title. they doesn´t differentiate between first name and surname, between one or two or more authors and so on.
finally that means -> if a book has more than one author and his name is more than John Grisham (i.e. "Dr. med. Peter R. Wellington & James A. Fulham") you always will have problems until they modify the "Dublin Core"-system worldwide. when and if this will happen - nobody knows.
and this also means, the softeware of ebook-readers have to be coded at least like the calibre-software to show the same in the library like it is written on the originally book. in my case that means, there is a problem with the tolino-software in displaying the metadata in a correct way.
thanks to everybody for looking to a solution.
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