Last name Йеспер (Jesper 
, Йеспер 
) , worldwide, is a rare cognomen. The cognomen Йеспер is characteristic of Denmark, where it is quite a rare surname, Sweden, where it is a rare surname, and Hungary. Measured by absolute frequency, the name is most common in Germany, Denmark, and China. Much more frequently, Йеспер is the forename as well as the last name.