Family name Gaiaz (Гаяз 
, Гаиаз , Gaiaz 
) , around the globe, is a very rare last name. The last name Gaiaz is habitual in Portugal, where it is a very rare surname, Kyrgyzstan, and Russia. Measured by absolute frequency, it most frequently occurs in Russia, Portugal, and Brazil. Much more prevalently, Gaiaz is the forename as well as the last name.