The family crest is of Spanish origin.The family came from Portugal.

The name Aguilar emerged in the ancient homeland of the Spanish people. Aguilar is a local surname. In Spain, hereditary surnames were adopted according to fairly general rules and during the late Middle Ages, names that were derived from localities became increasingly widespread. Local names originally denoted the proprietorship of the village or estate. The Aguilar family originally lived in a region close to an eagles nest. The surname Aguilar originally derived for the Latin word L'Aquillare which referred to a haunt for eagles.