The origin of surname Aguilar is Spain.

Although people were originally known only by their first names, it became necessary to adopt a second name to identify due to population growth.

The most common type of family name found in the region was the surname that derives from the name of the father.
During the Middle Ages the patronymic system adopted for surnames.
The Aguilar family originally lived near the nest of a group of eagles, this name derives from the Latin name L'Aquillare, which was given to a hunter of eagles.

The local names describe a region or place where they lived the first members of the lineage.

Some variations of this surname are: Aguilar, Aguilera, Aguilera, Aguiar, Aquilar and others.

The origin of surname Aguilar is located near Toledo, Spain.

The surname Aguilar was extended by Portugal.

An important representativity of this lineage in the history was the conqueror Jeronimo de Aguilar who take part of the Valdivia expedition of 1511.

This man had a life full of adventures, was a prisoner of Native Americans for 8 years until his rescue by Hernan Cortes who included it in their forces, which participated in the conquest of Mexico.