Alfonse is a variant spelling of the French name Alphonse, which is derived from the Germanic name Adalolfus. This name was popular among European royalty during the Middle Ages and is still used today, particularly in France and Italy. The name Alfonse has also been used in English-speaking countries, with notable historical figures bearing this name including Alfonso XIII of Spain and King Alphonse I of Portugal. In literature, it is the name of the protagonist in the French novel "Alphonse Daudet" by Émile Zola.
"Alfonse had its peak popularity between 1914 and 1923, with a high of 51 births in 1917. After that period, the number of births significantly decreased, reaching single digits from 1960 onwards. The name's last prominent year was 1986, after which it has been quite uncommon."