Portus Cale was a town whose name was derived from the  Callaeci, Gallaeci or Gallaecia people who were named after the Celtic god Cailleach.
The mainstream explanation for the name is that it is an ethnonym derived from the Castro people, also known as the Callaeci, Gallaeci or Gallaecia, a people who occupied the north-west of the Iberian Peninsula. Cala or Cailleach was the name of a Celtic god  in Scotland she is also known as Beira, Queen of Winter  and at the time the land of a specific people was frequently named after its deity. Portus Cale (Latinised version for "Port of Cale", original Celtic name Callaici, Cale) was an ancient town and port in current-day northern Portugal, in the area of today's Grande Porto. 
