Family name Rybyantsev (Рыбянцев 
, Rybyantsev ) , in the entire world, is a very rare cognomen. The family name Rybyantsev is habitual in Kyrgyzstan, where it is a rare surname, Belarus, where it is a very rare surname, and Russia. Much less frequently, Rybyantsev is the forename as well as the last name.