Zeko World(Zeko Gang) was created by 051 Young Money in Chicago as an honor to one of their fallen member named Isaiah "Zeko" Walker. Zeko was killed by rival gang members in the parking lot of a McDonald in the 700 block of East 47th Street. His killer was later apprehended and charged with his murder.
It is very common for gangs in Chicago to adopt nicknames following the death of their fellow members, for instance after 051 Young Money member Antonio "Fathead" Davis was murdered, the gang created 'Fatz World' in his honor. 051 YM also goes by the following names 'Lance Land', 'Los City' as well as various others.