Do all Sikhs have the last name singh?

No, not all Sikhs have the last name Singh. While "Singh," meaning "lion," is commonly adopted by Sikh men as part of their names to signify strength and bravery, many Sikhs may use other surnames. Women in the Sikh community often take the surname "Kaur," meaning "princess." Therefore, a variety of last names can be found among Sikhs, reflecting their diverse backgrounds.