Worldwide, Byby (Byby 
) is quite a rare principally feminine, but scarcely masculine first name. The first name Byby is habitual in the Democratic Republic of the Congo, where it is quite a rare feminine name, Romania, and Cameroon, where it is a rare girly name. Measured by absolute frequency, it most frequently occurs in the Democratic Republic of the Congo, Romania, and Algeria. Likewise, Byby is the last name as well as the forename.