In "Thieme-Becker"(Allgemeines Lexikon der Bildenden Künstler von der
Antike bis zur Gegenwart), Bd. 19 (1926) you find an article "Jonnard,
Paul", in which Jonnard is mentioned as one of the woodcutters of the
Doré-edition of Dante's "Paradis" (1869). ("Mitarbeiter an ... der
Doré-Ausgabe von Dante's "Paradis" (1869)). And in "Dantes Göttliche
Komödie, Drucke und Illustrationen aus 6 Jahrhunderten, Leipzig 2000,
S. 110, the following information on Dorés illustrations for the Divina
commedia is given: There were the woodcutters Pannemaker, Gusmand,
Jonnard, Pisan and Laplante making woodcuts for Doré, after his
drawings, and the plates were used for numerous reprints, followed by a
lot of editions with reproductions in lesser quality.
Maybe this would help you.