As indicated here many times but important to remember - the Almada name is a Portuguese noble name. The very first Almada may have been from Britain (serving under Sir William Long Sword). There is a town outside of Lisbon named Almada that is connected to this knight. My family's Almada line goes back to the discovery of the Azores in the 15th C.
Here's a link to the Noble Families of Portugal encyclopedia. Page 43 of the Almada family is where you find Don Joao Vaz de Almada - his daughter Mecia Almada marries Joao de Sousa Falcao and they go to the Azores where they become part of the governing class. When you look up the Falcao noble family history in the same encylcopedia, you get a more comprehensive history since the Falcao family became the captains of the Azores islands. My father is Jose Francisco Almada Braga. My family tree includes many Almadas from the 16th C to the 20th C. all in Santa Maria Island, Azores. Some great great uncles left the Azores in the 1800s for California and were never heard from again.
It is true that the Almadas went to Italy, Spain, Brazil, Mexico and California, but the beginnings of this family name is in and around Lisbon, Portugal. http://purl.pt/12151/3/hg-40102-v/hg-40102-v_item3/index.htm...
I've also attached a page from a 17th C Portuguese Coat of Arms manuscript that shows the ALMADA crest, as well as a marriage certificate from 1849 of my great great grandfather, Jose Antonio de Almada (from Santa Maria Island, Azores).