Heinrich Himmler | Heinrich Heine | Heinrich Schütz | Johann Heinrich Pestalozzi | Heinrich von Kleist | Heinrich Böll | Heinrich Isaac | Heinrich Marschner | Baron Hans Heinrich Thyssen-Bornemisza | Gratz | Heinrich Mann | Heinrich Hertz | Heinrich Graetz | Heinrich Böll Foundation | Christian Heinrich Friedrich Peters | Wilhelm Heinrich Roscher | Johann Heinrich Lambert | Heinrich von Breymann | Heinrich Finck | Heinrich Zimmer | Heinrich Wilhelm Ernst | Heinrich Wilhelm Dove | Heinrich Wild | Heinrich von Bibra | Heinrich Schenker | Heinrich Nordhoff | Heinrich Leutemann | Heinrich Gustav Magnus | Ernst Heinrich Weber | Wilhelm Heinrich, Duke of Saxe-Eisenach |
However, due to lack of comments regarding the sources for the Second Collection, many documents which passed through Firkovich's hands were promoted as skeptic among some Hebraists (Chwolson, S. L. Rapoport, A. Neubauer, Julius Fürst, Heinrich Grätz, Strack and Harkavy etc.).