The word "usabiaga" is a Basque surname that is pronounced as /usaβiaɣa/. The phonetic transcription shows that the "u" is pronounced as "u," the "s" as "s," and the "a" as "a." The "b" is pronounced as voiced "β," which is a sound somewhere between "b" and "v" in English. The "i" is read as "i" and the "g" is pronounced as the voiced velar fricative /ɣ/. The second "a" and the final "a" are pronounced as "a" again. Thus, the spelling of "usabiaga" corresponds very closely to its phonetic pronunciation.