 The number of Mambwe in Zambia has not been independently estimated, though the combined number of Mambwe and Lungu in Zambia was estimated to be 262,800 in 1993 .The mambwe people of Zambia are known to be great businessmen especially the Penza family known to be the most successful Mambwe family.They also distinguish the last names for males and females, like the Namwanga people, by applying prefixes "Si" and "Na" to be the first two letters of the last name e.g.