Family name Куйлиев (Куйлиев 
) , across the world, is a rare surname. The last name Куйлиев is habitual in Central Asia, particularly Tajikistan, where it is quite a rare surname, Kyrgyzstan, where it is a rare surname, and Kazakhstan, where it is a very rare surname. In absolute terms, it is the most numerous in Tajikistan, Kyrgyzstan, and Russia.