The name Alonza has its origins in the Spanish language, derived from the Germanic name Alonzo, which itself is a variant of the name Alfonso. The name Alfonso is a compound word formed by the Germanic elements "alf" meaning "elf" or "supernatural being" and "funsa" meaning "ready for battle" or "warrior."

This name was popularized in the medieval era, particularly during the reign of the Visigothic Kingdom in the Iberian Peninsula from the 5th to 8th centuries. It gained widespread recognition and usage with the rise of the Kingdom of Asturias, which later evolved into the Kingdom of León and the Kingdom of Castile.

One of the earliest recorded individuals bearing the name Alonza was Alonza Pérez de Guzmán, a prominent Spanish nobleman who lived in the 13th century. He played a significant role in the Reconquista, the campaign to retake the Iberian Peninsula from Moorish rule.

Another notable figure was Alonza de Aragón, a Spanish noblewoman who lived in the 14th century. She was the daughter of King Peter IV of Aragon and served as the regent of the Kingdom of Valencia during the minority of her nephew, King Martin I of Aragon.

In the 15th century, Alonza de Mendoza y Enríquez was a Spanish aristocrat and lady-in-waiting to Queen Isabella I of Castile. She was instrumental in the education and upbringing of the future King Philip I of Castile.

During the 16th century, Alonza de Cortinas Arellano was a Spanish writer and translator known for her work "Sumario de la vida de la Virgen María," a religious text published in 1552.

In the 17th century, Alonza de Saavedra was a Spanish painter and engraver active in Madrid. She was celebrated for her religious paintings and contributed to the artistic heritage of the Spanish Golden Age.

While the name Alonza has its roots in the Spanish language and culture, it has been adopted and used in various forms across different regions and time periods, reflecting the rich tapestry of linguistic and cultural exchange throughout history.