Alfonsa is a traditional female given name of Spanish origin, derived from the Germanic name Adalfuns, which consists of the elements adal "noble" and funs "ready". It was popularized by Saint Alfonsa of the Immaculate Conception, also known as Mother Alfonsa Gallagher, who founded the Sisters of the Immaculate Heart of Mary in Spain. The name is often used interchangeably with its variant spelling, Alfonso, which is more commonly associated with males. In English-speaking countries, Alfonsa is not widely used but can be found among families with Spanish or other European roots seeking unique and meaningful names for their daughters.
The name Alfonsa peaked in popularity during the post-WWII baby boom, with a significant increase in births between 1946 and 1956, totaling 77 births in that decade alone. However, it declined thereafter, with only sporadic occurrences from the 1960s onwards. The highest number of births recorded in a single year was 11 in 1947. Overall, there were 144 births named Alfonsa over this period.