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In the entire world, Jef (Jef , ジェフ , Джефф , along with others...) is quite a common male forename. The first name Jef is characteristic of Aland Islands, where it is quite a common boy's name, Belgium, and Netherlands, where it is quite a rare male name. In absolute terms, this name is the most popular in Belgium, Indonesia, and the United States. Very seldom, Jef is the last name as well as the forename.
Jef is also a prevalent name for the fictitious and mythical characters: Michael Jordan , the main protagonist in the 1996 film Space Jam; Jeffrey Lebowski , the fictional character from The Big Lebowski which is not 'The Dude'; Jeff Haffley , the character in The West Wing; Jeff the Killer , the fictional character in Creepypasta and Jeff Greene , the fictional character on "Curb Your Enthusiasm", and in many other works.
Ri, Harris, Fisher, Wilson, Mertens, Stevens, Pauwels, Peeters, Deckers, Dierckx, Lemmens, Janssen, Johnson, Hermans, Willems, Wellens, Wouters, Goossens, Janssens, Verheyen, Williams, Hendrickx, Jacobs, Vermeulen, Jansen, Santos, Rey, Tan, Fry, Maes, Cruz, Klak, Jeff, Thys, Frey, Smith, Smits, Smets, Aerts, Claes, Brown, Patat, Daems, Jones, Jefri, Hardy, Morgan, Luyckx, and Michielsen