The name Arnoldo is a masculine given name of Germanic origin, derived from the Old German elements "arn" meaning "eagle" and "wald" meaning "ruler." It is believed to have emerged around the 6th century AD, during the time of the Frankish Empire.

The earliest recorded use of the name Arnoldo can be traced back to the 8th century, when it was mentioned in the Monumenta Germaniae Historica, a collection of historical sources from the medieval period. One of the earliest known bearers of the name was Arnoldo of Metz, a Frankish nobleman and military leader who lived in the late 8th century.

During the Middle Ages, the name Arnoldo gained popularity across various regions of Europe, particularly in areas with Germanic cultural influence. It was borne by several notable figures, including Arnoldo I, Count of Chiny (c. 980-1037), a prominent nobleman in the Holy Roman Empire, and Arnoldo of Brescia (c. 1090-1155), an Italian scholar and religious reformer.

In the Renaissance period, the name was associated with prominent artists and scholars. One of the most famous bearers of the name was Arnoldo di Cambio (c. 1240-1311), an Italian sculptor and architect who contributed to the design of the Basilica of San Petronio in Bologna.

In the 17th century, Arnoldo Vinnio (1588-1657) was a Dutch jurist and legal scholar whose works helped shape the development of Roman-Dutch law. Another notable figure was Arnoldo Grevinckhoven (1600-1675), a Dutch Golden Age painter known for his landscapes and cityscapes.

Moving into the 18th century, Arnoldo Calesio (1715-1788) was an Italian painter and engraver who worked in the Baroque and Rococo styles. Arnoldo Winkler (1751-1834), a German-born architect, designed several notable buildings in Russia, including the Grand Palace in Pavlovsk.

Throughout history, the name Arnoldo has been borne by individuals from various fields, including literature, politics, and science. While it has maintained a presence in various European cultures, it has also found its way into other regions due to migration and cultural exchange.