IIRC had some relative of Charles Lindbergh’s not changed the family’s name before the birth of the famous (or, perhaps, “infamous”) aviator’s birth, he would have been known as “Charles Manson.”
The two George Millers who are both Australian movie directors:
Since by now the “unusual name” factor is gone, I’ll throw in the ones that always threw me for a loop:
Samantha Fox, American porn star in the 70s/80s.
Samantha Fox, British topless Page 3 model and pop singer.
I was a big fan of the British version when I was a kid, and man was I disappointed when I finally was able to catch one of the US version’s movies on cable.
I also always wondered why British pop star George Michael was so keen on hosting a sports show on NBC, the George Michael Sports Machine. Oops.
And one of my faves that I was hip to, but that invariably disappointed young girls dragged by their brothers to comic book conventions in the 1980s… Marvel writer Ralph Macchio is definitely not Ralph Macchio of Karate Kid fame.
But why would the US Army Survival Manual be referencing Peter Sellers/Sellars? 
:smack: You know, I wouldn’t normally make that mistake, but I was posting while sleep-deprived (about eight hours’ worth over the previous three days), and I was not firing on all cylinders, to put it mildly. Thank you for being so gentle in your correction!
(I’ve just now gotten up after nine hours of sleep, and I feel almost human.)
Christopher Columbus, discoverer of America
Christopher Columbus, film director
William Shakespeare, playwright
William Shakespeare, inventor of the level-winding fishing reel
George Washington, Father of Our Country
George Washington, inventor of instant coffee
There are currently two running backs in the NFL named Adrian Peterson.
In the 70’s, both the Vikings and the 49ers had wide receivers named Gene Washington.
Speaking as a member of the proud Frakkenhammer family I’ll thank you not to mock my cousin Flagstaff {which is really only his porn name anyway, his real name is Dudley}
From two small towns in Maine
Dick Hurtz from Holden
Dick Hurtz from Patten
Derek Lowe, pitcher
Derek Lowe, chemist and blogger
Derek Lowe, actor
Mark Clayton was an NFL wide receiver in the 1980s and 1990s, primarily with the Dolphins. He was one of the “Marks Brothers”, favorite targets for Dan Marino.
Mark Clayton is currently an NFL wide receiver, playing for the Rams, after several years with the Ravens.
Tom Cruise, famous nut-bar actor.
Tom Cruise, slightly less famous young English footballer (soccer player, whatever)
Bob Marley, reggae legend (black)
Bob Marley, Maine comic (white)
That reminds me…
George Wallace, politician. Notable mainly for his segregationist beliefs.
George Wallace, comedian. Black.
These are somewhat unusual in the English-speaking world, though less so in the Portuguese-speaking one, as Silva is the most common surname there.
Anderson Silva, MMA fighter
Anderson Silva, kickboxer
Thiago Silva, MMA fighter
Thiago Silva, footballer playing for A.C. Milan
Thiago Silva, footballer murdered in 2008
Tiago Silva, footballer playing for K.R.C. Genk
Rafael Pereira da Silva, footballer playing for Manchester United
Rafael Pereira da Silva, footballer playing for Goiás
As I’ve recently discovered, names like this are a nuisance for disambiguators on Wikipedia. If someone just links to plain old Thiago Silva, it can be hard to figure out by context which one they meant to refer to.
There’s also the Prime Minister’s ancestor, who was a soldier, historian, and politician in the 17th century.
The latter two are particularly interesting because the American Churchill (apparently no relation) was initially more famous. This led to [frequent confusion](Winston Churchill (novelist) - Wikipedia with the British statesman) of the two during their lifetimes. They corresponded about it, and the British Churchill started signing works with his middle initial S. (for Spencer). The American one said he would have done the same, except he didn’t have a middle name.
I know it doesn’t count, but I have an irresistible urge to mention all the various real life people Lost characters were named after, particularly philosophers.
James Dean, rebel without a cause.
Jimmy Dean, singer with a sausage.
Harrison Ford, action movie star
Harrison Ford, Action Movie Star
This is interesting. I assumed that Scrivener understood the difference and intentionally used ‘pneumonic’ just to be whimsically amusing.
Again, the names are quite common, but this perhaps is a coincidence worth of this thread:
Steve Jackson is the name of two different game designers. One wrote several books in a series the other started; the books make absolutely no mention of the fact that the two people involved are different.
At least they’re from different countries.