How many people have you known named Robert Johnson ?

I personally don't know any named that.

Zero

I've never met anyone with that name .

I have known far too many people to remember a single common name.

I have. 

 

  One, but Robert is his middle name. Does that still count?
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I know two people who are currently alive with that name.  One is my uncle (mom’s brother) and my cousin (mom’s brother’s son).  That was also my mom’s dad’s name and his dad’s name, but neither of them were still alive by the time I was born.

859.3