People belonging to the Sikh religion have the last name “Singh” (meaning “Lion”) for males, and “Kaur” (meaning “Princess”) for females. This was enacted by the tenth Guru in order to eradicate the categorizing of people to their caste and/or occupation by their last names. It also emphasized equality among the Sikhs and gave them an identity that would be recognizable.

source: http://en.wikipedia.org/wiki/Indian_name