From WikiPilipinas: The Hip 'n Free Philippine Encyclopedia
The term "Davaoeño" refers to a native or a resident of Davao City, and the provinces of Davao (also known as Davao del Norte), Davao del Sur and Davao Oriental. The word -- which is used both as a noun and as an adjective -- is of Hispanic origin, in the same nomenclature as "Manileño". In Filipino it is Dabawenyo (male) or Dabawenya (female).
The true native Davaoeños are the cultural minorities (e.g., Bagobos, Manobos, etc.) that have been living in the Davao Region even before the Spanish conquistadores arrived in the late 1800s. Ever since Davao, especially Davao City, began urbanization, however, a huge influx of migrants have found homes in and around the city, and have considered themselves Davaoeños. As the author has declared in the Ang Dabawenyo blog: "A Dabawenyo is not only the Davao-born, but anyone who professes a love of this beautiful city in the Philippine South."