here. (This question arose because there is a Singh in Poul Anderson's Ensign Flandry and both a Singh and a Kaur in SM Stirling's The Sunrise Lands.)
Sikh men are surnamed "Singh" whereas Sikh women are surnamed "Kaur."
"Singh" means "lion" so does "kaur" mean "lioness"? See SM Stirling, The Sunrise Lands
(New York, 2008), Chapter Eight, p. 187. If so, should the two words
not have the same root but with an affix for feminine gender?
When learning about Sikhism, I was told or read that "kaur" means "princess." See here.
The Wiki article here tells us that "kaur" means "prince" but is applied to women as a sign of their equality.