I am wondering what places you know of that look like they are named after something/someone famous, but were actually named after something else. For example Lincoln County, ME got its name 50 years before Honest Abe was born. It was named after a town in England.
The various cities in the US called Alexandria are not named after the city in Egypt (and hence the very famous Alexander the Great), as one might assume, but much more obscure individuals with either the first name or last name of Alexander.
Here is an amusing list of Americanised place names:http://mentalfloss.com/article/50967/20-towns-named-other-towns-pronounced-differently
eg “Texas has a town named for the whole country of Italy. Itly. Just two syllables.”
Cleveland, OH is a sort of in-between case: The city is named after Moses Cleaveland, who was one of the first settlers, but the spelling “Cleveland” became popular because of President Grover Cleveland.
King County, Washington was originally named for the Vice President Elect under Franklin Pierce, William Rufus DeVane King. In 1986 the county was renamed for Dr. Martin Luther King.
St. George Utah isn’t named after the guy who killed the dragon, but after George A. Smith, a nephew of Joseph Smith who started the LDS church. The Mormons, were, after all, the Latter Day Saints.
Canary Islands are named after an animal, but not the canary. They’re (likely) Canariae Insulae, or Isle of Dogs.
While it is a bridge (and an outer one at that), the Outerbridge in NYC is named after Eugene Outerbridge.
Augie Busch wanted to name the stadium he built for the St. Louis Cardinals “Budweiser Stadium”, but at the time (early 1950s), Major League Baseball was opposed to naming stadiums after alcoholic beverages. So he named it Busch Stadium instead, after himself.
Then the very next year his brewery introduced their new Busch beer. 
Oakland, CA actually was named after Oak Trees, as it was originally a huge Oak woodland. But you’d never know it today! There isn’t a single oak tree left from pre-settlement times.
Los Angeles wasn’t really named after “The Angels”, as it’s actual full name was “El Pueblo de Nuestra Señora la Reina de los Ángeles del Río de Porciúncula”. So it was actually named after Mary, Queen of the Angels. Later, shortened to just: Los Angeles.
New Berlin, WI. Not named after the city in Germany but rather after the city of the same name (New Berlin) in New York.
Also, it’s pronounced differently than than Berlin, Germany. The other syllable is stressed. I don’t know how they say it in NY though.
Arab, Alabama was named after a guy named Arad Thompson and then misspelled by the US Postal Service.
Dildo, Newfoundland is not named for a sex toy but for a thing to do with boats.
You know, when you put it that way, it still sounds dirty.
The bird is named after the island, not the other way around.
There may be present-day confusion over Islamorada, an incorporated village in the Florida Keys. In years past it might have been clearer that this was Spanish (“isla” being island and “morada” being dwelling).
With the word Islam being in the US news more than it used to be, some may misread the place name as having something to do with, well, Islam.
Rooster Rock in Oregon wasn’t named after Foghorn Leghorn. It was originally called Cock Rock because of its phallic appearance, then renamed Rooster Rock to be less offensive.
New York City’s Union Square has nothing to do with labor unions or the Union Army - it’s named for the junction, or “union,” of Fourth Avenue and Broadway.
Many people think that Hubbard Glacier in Alaska was named after Bernard Hubbard, SJ, who was a well-known explorer in Alaska in the first third of the 20th century, and who popularized the territory through books, film and lecture (his books are excellent, by the way). In fact, it was named after Gardiner G. Hubbard who was the founder and first president of the National Geographic Society.