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Sikhs have a given name and one or both of a surname and a Khalsa name. The surname may be a family name or a caste name. Different castes still exist today in some aspects of Punjabi culture; similarly to the Hindu caste system, this system is based on employment.
On becoming a Khalsa, the Sikh undertakes the obligation to wear the physical symbols of this status and takes the name "lion", usually romanized as Singh, if a man, or /kaur/ "the Crown Princess" for female, usually romanized as Kaur, if a woman. These names reflect the strong egalitarianism of the Sikh religion. The adopting of the Khalsa name is symbolic for being a member of a larger family or faith. These names were originally intended to replace the Sikh's original surname, which was often a caste name.
Some Sikhs do replace their original surname with their Khalsa name, but many retain their original surname and add the Khalsa name before it. Thus, a man born Sandeep Brar should become Sandeep Singh but more likely will become Sandeep Singh Brar. Similarly, a woman born Harjeet Gill should become Harjeet Kaur or Harjeet Kaur Gill.