the oil field around 1982. Naming conventions (Nya) Nyadä meaning my daughter "And all females name begin with (Nya) of", is the standard prefix used for female names. Gat, meaning " baby of", is a common prefix for male and female gender form as gatnyal(baby girl) and gatdhöl Children are commonly given names to mark historical events ("Dɔmaac" meaning "bullet", or Mac meaning "fire or gun" given to a child born during times of war or from another man in the name of the deceased father who legally married the mother ). Nhial means "sky", and is a common name for males and females. Many Nuer have been exposed to missionaries and carry a Christian first name. Their second name is a given name and always in Nuer. The father's given name follows the child's given name, which is then followed by the grandfather's name, and so on. Many Nuer can easily recount ten generations of paternal lineage because they carry those names themselves. When a Nuer comes to the Western world, which wants a first and last name, it is their custom to give their name as their first name followed by their father's name as their middle name and their grandfather's name as their last name. After the civil war, the Nuer began accepting cash currency into their economy, changing the dynamics of their cattle and how they were viewed. Each type of cattle is titled according to how they are acquired such as: "the cattle of money" (purchased with cash currency) and "the cattle of girls/daughters" (bridewealth). Most Nuer people are nicknamed after their cattle. The boys usually chose the name of their favorite cattle based on the form and color of the ox. The girls are named after the cows that they milk. Sometimes the cow names are passed down. Oil Oil exploration and drilling began in 1975 and 1976 by companies such as Chevron. In 1979 the first oil production took place in the southern regions of Darfur. In the early 1980s when the north–south war was happening, Chevron was interested in the reserves in the south. In 1984 guerrillas of SPLA (Sudan People's Liberation Army) attacked the drilling site of the north at Bentiu. In return, Chevron cleared Nuer and Dinka people in the oil fields area to ensure security for their operations. The Nuer-Dinka struggle in oil fields continued in late 1990s into