Most but not all names are derived from the Guru Granth Sahib and in most cases describe God's attributes and not ours. (ie. immortal, infinite beauty, most intelligent, unfathomable, unapproachable, victorious, pure, ageless etc.)
In 1699, Sikh Women were given the last name 'Kaur' and and Men 'Singh' by Guru Gobind Singh, the tenth Guru. This initiate intended to end the caste system, social stratification and much of the apparatus of Hindu ritual and legalism. In Indian society, an individual's name reveals his or her caste, and Sikhs were freed from the caste system by having all men incorporate Singh in their names and all women, Kaur. (Reference). Lookup Sikh Names at SikhNames.com
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