Cognomen Yacov (Яков 
, Yacov 
, ياكوف) , all around the world, is quite a rare last name. The cognomen Yacov is habitual in Bulgaria, where it is quite a rare surname, Armenia, and Kyrgyzstan. In absolute terms, the name is most common in Russia, Bulgaria, and Kyrgyzstan. Predominantly, Yacov is the forename as well as the last name.