>>213026 (OP)>The Galicians (Gallecus) were named for their whiteness (cf., “milk”) – and hence also the Gauls (Gallus) were named – for they are of whiter complexion than the other people of Spain. They claim a Greek origin for themselves, and hence are wise with a native wit. 111. They say that, after the Trojan War, Teucer was despised by his father Telamon because of the death of his brother Ajax. When he was not received into his kingdom, Teucer retired to Cyprus and there founded the city of Salamis after the name of his ancient homeland. From there he emigrated to Galicia, and when he had settled there he gave the name of the place to the nation. -- Saint Isidore of Seville, Etymologyes, Book IX. (VI century AD)
It appears that while the rest of Spain bleached during Reconquista migrations of Asturians, Cantabrians, Basques, Gascons and others to the south. The Galicians became browner.