Alphonsus, deriving from the Germanic elements 'alf' meaning elf and 'huns' signifying warrior, was a popular name in medieval Europe, particularly among nobility. It is often associated with Saint Alphonsus Liguori, an Italian Catholic bishop known for his writings on moral theology.
The name Alphonsus experienced a notable rise and fall in popularity over the past century, with peaks in the early 20th century (1917-1925) and most recently in 2022-2023.