Last name Τζακ (Jack 
, Τζακ, Seoc) , throughout the world, is a widespread surname. The family name Τζακ is characteristic of Saint Vincent and the Grenadines, where it is a widespread surname, Marshall Islands, where it is a common surname, and Trinidad and Tobago (explore the name in all countries). Measured by absolute frequency, the name is most common in Indonesia, Myanmar, and the United States. More frequently, Τζακ is the forename as well as the last name.