Cognomen ツクイ (ツクイ 
, Tsukui 
) , all over the world, is a rare family name. The cognomen ツクイ is habitual in Japan, where it is a very rare surname, Germany, and France. Measured by absolute frequency, this name is the most popular in Japan, the United States, and Germany. Predominantly, ツクイ is the forename as well as the last name.