How did the last name Del Cid end up in Mexico?

There is no historical evidence that the last name "Del Cid" originated from Mexico. It can be traced back to the Iberian Peninsula, specifically the region of Castile in Spain. The name "Cid" is derived from the Arabic word "sayyid," which means "lord" or "master," and was commonly given to great warriors or leaders in the Iberian Peninsula during the Reconquista, the period of Christian reconquest of the Iberian Peninsula from Muslim rule that began in the 8th century and ended in the 15th century.

The most famous bearer of the name Del Cid was Rodrigo Díaz de Vivar, a Castilian nobleman, military leader, and national hero of Spain, known as El Cid Campeador (The Lord Champion), who lived in the 11th century and is considered one of the greatest military leaders of the Christian kingdoms in the fight against the Muslim states.

After the Reconquista, the Del Cid lineage spread throughout Spain and later into the Spanish territories in the Americas, including Mexico, as part of the Spanish colonization efforts. During the colonial period, many European settlers with Spanish surnames, including Del Cid, moved to the New World, and their descendants eventually integrated into the local populations of the Americas.