Alonso is a Spanish given name of Germanic origin, serving as a Castilian variant of Alfonso. The name evolved from the Visigothic name *Aþalafuns, which combines the elements aþals meaning "noble" and funs meaning "ready," thus signifying "noble and ready." During the Early Middle Ages, around the 9th century, the original form Alfonso underwent a phonetic shift in which the /f/ sound became mute /h/, eventually leading to the suppression of /f/ and the emergence of Alonso. This change was not uniform across the Iberian Peninsula, so both Alfonso and Alonso persisted in different regions. Historical and Cultural Context The root name Alfonso was borne by numerous kings of Spain (including Asturias, León, Castile, and Aragon) and Portugal, starting with Alfonso I of Asturias in the 8th century. The name's royal pedigree lent prestige to its variants, including Alonso. In Spanish-speaking countries, Alonso has been used both as a given name and a surname. As a surname, it is particularly common in Spain, Mexico, Cuba, and Argentina, reflecting historical migration patterns. Notable Bearers Notable individuals named Alonso include Spanish Formula One driver Fernando Alonso Díaz, though his surname is Alonso. In the arts, Spanish actor Alonso de los Ríos and Mexican singer Alonso Luján have carried the name. The name also appears in literature, such as in Shakespeare's The Tempest, where Alonso is the King of Naples. Related Forms Feminine forms include Alfonsa. In other languages, equivalents include Alfons (German), Fons (Dutch), Alphonso and Alphonzo (English), as well as diminutives like Lon and Lonnie (English). Meaning: "noble and ready" Origin: Visigothic, via Spanish Type: Given name and surname Usage Regions: Spain, Latin America, Philippines