What is the One??

I have one
You have one
mother uses father's one
And auntie uses uncle's one

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

A Pope doesn't use his 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?
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Ans : Surname