A married lady would acquire one 
But a divorced lady would lose her one 

A Pope doesn't use his one 
Lee Kuan Yew has a short-short one 
Mao Ze Dong had a hairy one 
Lord Krishna had a long-long one 
Arnold Schwarzenneger has a longer one 
Michael J. Fox has a shorter one 
Madonna doesn't have one 
The Chinese usually have short ones 
While the Indian usually have long ones 

Do you have one? 
How long is your one? 
Which one is your preferred One? 

As you may have already guessed, the answer to the riddle is none other than YOUR ...

... VERY OWN ...
 

... SURNAME!!!