Last name Sarby (Сарби 
, Сарбий , Sarby 
) , across the world, is a very rare cognomen. The last name Sarby is habitual in Denmark, where it is a rare surname, Kyrgyzstan, and Greece, where it is a very rare surname. In absolute terms, it is commonest in the United States, Denmark, and Kyrgyzstan. More prevalently, Sarby is the forename as well as the last name.