The name Arnez is believed to have originated from the Basque region of Spain and France, dating back to the early medieval period. It is derived from the Basque word "arnetz," which means "valley of the ferns." The name was likely given to children born in or near such valleys, where ferns were abundant.

One of the earliest recorded instances of the name Arnez can be found in the Codex Calixtinus, a 12th-century medieval manuscript that served as a guide for pilgrims on the Camino de Santiago. The manuscript mentions an individual named Arnez de Pamplona, who was a local guide and innkeeper along the pilgrimage route.

In the 13th century, an Arnez de Béarn was a prominent knight and military commander who fought in the Crusades. He is mentioned in several chronicles and historical accounts of the time for his bravery and leadership during the sieges of Acre and Tripoli.

During the Renaissance period, Arnez Carreño was a renowned Spanish poet and playwright from Seville, born in 1521. His works, including the play "La Vida es Sueño," were widely celebrated and influenced the literary movements of his time.

In the 18th century, Arnez Villanueva was a Spanish explorer and navigator who led several expeditions to the Pacific Ocean and the coasts of present-day California and Oregon. His detailed maps and journals contributed significantly to the exploration and understanding of these regions.

More recently, Arnez Hallström was a Swedish-Basque artist and sculptor born in 1892, known for his modernist works and innovative use of materials like concrete and steel. His sculptures can be found in public spaces throughout Europe and the Americas.

While the name Arnez has its roots in the Basque region, it has been adopted and used in various cultures over the centuries, although it remains relatively uncommon in modern times.