Thanks, Jason, I hadn't noticed this character [DiscretionaryHyphen] until now.

Unfortunately, it doesn't seem to be used for hyphenation:

Block[{dhyp = "­"(* contains a DiscretionaryHyphen ­*), 
   nameL = {"Ein", "Sehr", "Langer", "Name", "Der", "Getrennt", 
     "Werden", "Sollte"}, name},
  (* Make a String name from list nameL with inserted 
    DiscretionaryHyphen(s) *)
  name = StringRiffle[nameL, dhyp];
  Print[Column[{Style["{nameL,name,name}:", Blue],
     nameL // InputForm, name // InputForm, name // FullForm}]];
  CellPrint[TextCell[name, PageWidth -> 100, Hyphenation -> True]];
  ];