The associated coat of arms for this name are recorded in J.B Rietstaps Armorial General. Illustrated by V & H.V Rolland's. This Monumental work took 23 years to complete and 85,000 coats of Arms are included in this work. This name ACERO is a Spanish nickname for an inflexible person or a metonymic occupational name for a maker of steel objects. The name was originally derived from the Spanish word ACERO, and rendered in medieval documents in the Latin form FERRUM. The name would have applied to a maker of swords or weapons of war. Many of the modern family names throughout Europe reflect the profession or occupation of their forbears in the Middle Ages and derive from the position held by their ancestors in the village, noble household or religious community in which they lived and worked. The addition of their profession to their birth name made it easier to identify individual tradesmen and craftsmen. As generations passed and families moved around, so the original identifying names developed into the corrupted but simpler versions that we recognise today. It was in the cities and large towns that the various workers in metal of one kind or another developed. Protected and matured by the craft guilds they formed in the Middle Ages, they rose in rank above the peasants in the country districts. They were considered to be highly skilled craftsmen. Men did not hesitate to engage in fierce combat during this time, and they desired as much armour and strong weapons as possible. The name is also spelt ACERRO. In the 8th century, Spain fell under the control of the Moors, and this influence, which lasted into the 12th century, has also left its mark on Hispanic surnames. A few names are based directly on Arabic personal names. The majority of Spanish occupational and nickname surnames, however, are based on ordinary Spanish derivatives.In Spain identifying patronymics are to be found as early as the mid-9th century, but these changed with each generation, and hereditary surnames seem to have come in slightly later in Spain than in England and France. As well as the names of the traditional major saints of the Christian Church, many of the most common Spanish surnames are derived from personal names of Germanic origin. For the most part these names are characteristically Hispanic. They derive from the language of the Visigoths, who controlled Spain between the mid-5th and early 8th centuries.