The tenth guru of Sikhs, Guru Gobind Singh introduced Kaur and Singh, when he administered Amrit (baptism) to both male and female Sikhs. All female Sikhs were asked to use the name Kaur after their forename and male Sikhs were to use the name Singh. (Since 'Kaur' means "Crown Prince",  . The name acts as a symbol of equality among men and women.) This custom further confirmed the equality of both genders as was the tradition set by the founder of Sikhism, Shri Guru Nanak Dev Ji. It was intended to give women a sense of self-respect and warrior ethos. Singh is also used by some non-Sikh women because Singh can be the surname for several other cultural communities. It is the most common surname used by Sikhs. It is not mandatory to be baptized to include Kaur and Singh in the name.
Kaur provides Sikh women with a status equal to all men. This was also intended to reduce the prejudice created by caste-typing based on the family name. Prejudice based on caste was still rampant during Guru Gobind's time (17th century). This particularly affected women who were expected to take their husband's family name upon marriage. The British required women to take on their husbands' names.
Sikh principles believe that all men and women are completely equal. Therefore, a woman is crowned with great responsibility and can lead her own life as an individual, equal to men. She does not need a man's title to raise her own status. Saying this would go against the principles stated in the Sri Guru Granth Sahib, the religious text of Sikhism. Guru Nanak Dev Ji states:
Also, Gurbani (the text from Guru Granth Sahib) addresses every individual (irrespective of gender) as female. And combining from the above defined excerpt from Guru Granth Sahib  it can be easily concluded the temporal status of woman is higher than of man and they are equal only spiritually.
Immigration issues: Common surname
A section of around a million adherents of Sikhism who live abroad in western countries keep only Singh or Kaur as their last name. This has caused legal problems in immigration procedures, especially in Canada with the Canadian High Commission in New Delhi, India for a decade stating in letters to its Sikh applicants that "the names Kaur and Singh do not qualify for the purpose of immigration to Canada." People with these common Sikh surnames had to change their last names before coming to Canada. This had been causing emotional, legal and financial hardship for Sikh applicants in India who were complying by undergoing costly and lengthy name change procedures out of fear that their application to immigrate to Canada would be rejected outright otherwise. However, as soon as the media got involved and after a storm of complaints from Sikhs, Citizenship and Immigration Canada, Ottawa reversed New Delhi office's 10-year decree with Canadian Federal immigration officials further clarifying that "asking applicants to provide a surname in addition to Singh or Kaur has been an administrative practice used by our visa office in New Delhi as a way to improve client service and reduce incidents of mistaken identity. This was not a mandatory requirement. There is no policy or practice whereby people with these surnames are asked to change their names, the letters that were sent out to Sikh clients in Delhi were poorly worded."
- Singh, Khushwant; Rai, Raghu (1984). The Sikhs. Lustre Press.[page needed]
- "Significance and importance of the name Kaur". www.sikhwomen.com.
- "The Crown Prince". www.dhillonmarty.org.
- "Meaning, Significance, and Pronunciation of Sikh Names. Kaur, The Crown Prince".
- Dr. McCleod, Head of Sikh Studies, Department of South Asian Studies, McMaster University, Hamilton, Ontario, Canada.
- Singh, Khushwant. A History of the Sikhs, Volume I.
- Guru Granth Sahib, p.473.
- • "Common Sikh names banned under Canada's immigration policy". CBC News. Canada. July 23, 2007. Archived from the original on January 7, 2011.
• "Meaning of the word 'Kaur'". sikhwomen.com.
• "Speaking Notes: Statement from the Minister of Citizenship and Immigration on Surnames on Permanent Resident Applications". Government of Canada. Ottawa, Ontario, Canada. July 26, 2007.
• "Sikh name-change letter 'poorly worded': Immigration Canada". CBC News. Canada. July 25, 2007. Archived from the original on October 16, 2010.
• "Sikh group slams immigration name change policy". CBC News. Canada. July 25, 2007. Archived from the original on October 16, 2010.
• Binks, Georgie (July 25, 2007). "Tune that name". CBC News. Canada. Archived from the original on June 8, 2008.
• "Letter to CBCNews.ca from Citizenship and Immigration Canada, Clarifying the names policy". CBC News. Canada. July 26, 2007. Archived from the original on May 8, 2012.
• "Common surnames". CBC News. Canada. July 26, 2007. Archived from the original on November 3, 2012.
• Hsu, Spencer S.; Aizenman, N. C. (June 17, 2007). "FBI Name Check Cited In Naturalization Delays, Official Calls Backlog 'Unacceptable'". The Washington Post.
• Singh, Khushwant (26 July 2007). "No more Singhs, Kaurs on visa forms: Canada". The Times of India.
- Grewal, San (July 26, 2007). "'Singh' ban denounced". Toronto Star.
- Khushwant Singh, History of Sikhs: 1469-1838, Vol I, Oxford University Press, 2004, page 80, footnote 14.