Turcos?

Well, the naming of the two sides supporters goes to a more profound historical context of the two Galician cities. There's a popular saying called "en Vigo si trabaja, mientras en Coruña si relaja", ie. Vigo works, while A Coruña rests. During the early part of the 20th century, the Coruña economy was not in the best of states and many of its residents who were not attached to the port were unemployed, causing many of them to emigrate to various regions within Spain, the most popular of those being southern Spain, or the Andalucia province, a province with a rich Muslim tradition. As seen nowadays, there are many Galician families who live in Andalucia. Since Turkey is a Muslim nation, the association between the peoples of Coruña were made, and thus came the insulting term the turks, as we see to this day, is very much derogatory in the West. What was surprising is that Coruña residents accepted this name and became proud of it, and as Depor's success grew internationally, so did their following in Turkey, a football mad country on its own, which learned of the nickname.

The portuguesas was a responding insult from Depor fans over the last 15 to 20 years, due to the proximity of Vigo to Portugal and the superiority complex many Spaniards feel towards the country of Portugal.

 

You pretty much nailed it, south of galicia is where some galicians wish to be reunited with portugal, as they feel they are portuguese. Northern galicians, tend to not have the seperatist feelings.