Family name Gersui (Jersey 
, Gersui 
) , all over the world, is quite a rare cognomen. The family name Gersui is habitual in Jersey, where it is quite a common surname, Guernsey, and Israel, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Indonesia, the United States, and Philippines. Also, Gersui is the forename as well as the last name.