Alonso is the Spanish form of Alfonso, a Visigothic name from the Germanic elements adal, "noble", and funs, "ready", so roughly "noble and ready". Cervantes gave it to his hero: the hidalgo who calls himself Don Quixote is really Alonso Quijano. Alonso has been in the US top 1000 continuously since 2000, peaked at number 622 in 2002 and ranks number 785 among boys in 2025.