Cognomen ジャム (Jam 
, Jammes 
, ジャム 
) , across the world, is a common last name. The surname ジャム is characteristic of Reunion, where it is quite a common surname, United Arab Emirates, and Albania. Measured by absolute frequency, it most frequently occurs in Pakistan, India, and Indonesia. More frequently, ジャム is the forename as well as the last name.