Franz von Sickingen is an instance that already Germany knew the name; but it did not take root there at once.  The grandchildren of François I., intermarrying with the house of Lorraine, rendered his namesakes plentiful, both in the blood-stained younger branch of Guise, and in the dull direct stem, the continuation of the Karlingen, who at length, by the marriage with Maria Theresa, were restored to the throne of Charlemagne, in the person of him whom the classicalizing Germans termed Franciskus I.  This cumbrous form is still official, but Franz is the real name in universal use in the German parts of the Austrian Empire, though the Slavonic portions generally use the other end of the word, as Zesk. (History of Christian Names, Yonge, 1884)