Costa

Costa is the Latin costa, a rib, and every Romance language did the same thing with it. A rib is a ridge under the skin, so the word slid from the body to the ground: a slope, a hillside, and then the edge where land meets sea. The surname is what happens when a man is known by the ground he lives on: not Giovanni the miller, nor Giovanni son of Piero, but Giovanni of the slope, because the slope is what the whole parish can point at.

It was never carried from one country to another. It arose in Italy, Portugal, Galicia and Catalonia independently from the same root, and is found in French and Maltese too. In Spain it is Catalan and Galician rather than Castilian, which produced Cuesta instead. Costa families in Genoa, Porto and Barcelona are not cousins who drifted apart. Hence the surviving preposition: Della Costa in Italy, da Costa in Portugal, Coste elsewhere, all meaning of the slope, or of the coast.

Surnames came late to western Europe, spreading from the 11th century among the nobility first and only slowly downwards, and for a long time were not inherited at all: a man was described afresh each generation. Italians outside the aristocracy began taking hereditary surnames around 1450, and Italy holds the largest stock of surnames of any country in the world, over 350,000.

The moment they stopped moving is documented. After the Council of Trent, parish registration of baptisms and marriages became compulsory in Italy in 1564, and once a priest wrote a family into the register year after year the description hardened into an inheritance. A Costa who came down into the town was Costa in the book, and so were his grandchildren, whether or not any of them lived on a slope again.

The Italian distribution is a map of the word itself. The name is commonest in Liguria, the province that is one long steep coast, at about one person in 214 against one in 801 nationally, then Sicily, Piedmont and Veneto. Spain repeats the pattern on its own edges: one in 399 in the Balearic Islands, then Catalonia, Galicia and the Valencian Community, against one in 1,531 nationally.

In Italy the name reaches the Renaissance early through the painter Lorenzo Costa, 1460 to 1535, then runs through science, the church and public life: the zoologist Oronzio Gabriele Costa, 1787 to 1867, and Cardinal Elia Dalla Costa, 1872 to 1961, whose surname still carries the old article. Michael Costa, 1808 to 1884, left Italy to become a leading composer and conductor of Victorian London.

On the Spanish side it is still a coastal, non-Castilian name: the tennis players Carlos Costa, born 1968, and Albert Costa, born 1975, are Catalan, and the footballer Jaume Costa, born 1988, is Valencian. For a Spanish Costa the honest answer is usually a shoreline where Castilian was not the first language.

Portugal is where the name went furthest into public life; about one Portuguese person in 67 is a Costa. It begins with Jorge da Costa, 1406 to 1508, a cardinal who lived a hundred and two years, and runs on through Manuel da Costa, 1541 to 1604, a Jesuit missionary of the age of the ships.

Then the republic, and the name at the top of the state again and again. Alfredo Luís da Costa was one of the perpetrators of the Lisbon Regicide of 1908 and died in it at twenty-five. Afonso Costa, 1871 to 1937, was prime minister from 1913 to 1917; Francisco da Costa Gomes was president from 1974 to 1976, the years the dictatorship fell; and António Costa, born 1961, was prime minister from 2015 to 2024, then President of the European Council.

There is a second route into the surname, and in Portugal it is a large one. Costa was among the names taken by Jews who became Christians under the forced conversions of the Iberian kingdoms. A convert needed a Christian name and took a Portuguese one; a plain, common toponymic like Costa was exactly the kind that drew no attention.

The proof is in the lives of those who left. Uriel da Costa, 1585 to 1640, became a famous Portuguese Jewish philosopher, a man whose life was a long struggle over what he was permitted to believe. Where converso families reached the tolerant cities of the north the name reappears openly Jewish: Isaac da Costa, 1798 to 1860, a Dutch Jewish writer, and in England the Sephardic Mendes da Costas, among them the naturalist Emanuel Mendes da Costa, 1717 to 1791.

This should be said carefully, because it is often said carelessly. The name does not by itself mark converso descent: Costa was common in Iberia long before the conversions and long after. Some lines run back to that moment and some do not, and none is settled by the spelling alone.

Costa travelled with the sea powers whose coasts it names. By the 2014 count, 71 per cent of the world's Costas were in Brazil; Portugal held 7.6 per cent, Italy 3.7 per cent, the United States 2.4 per cent, Spain 1.5 per cent. The European emigration shows in what followed: Joseph Costa, 1909 to 1998, a Portuguese-born aviator in the United States, and in Australia the produce merchant Frank Costa, 1938 to 2021.

Those numbers need care as well as pride: the name spread by colonisation as much as by emigration, and a Costa surname abroad does not by itself prove a line running back to a Portuguese or Italian hillside. Where it does, that line is usually recoverable one parish register at a time. Costa is not one family and never was. It is a description of the ground, arrived at independently in four corners of Latin Europe and carried out of them by people who often had nothing else to carry.