Here is a list of every English word that I could find that is named after a President of the United States, with every term that is neither a place name or just a president's name with a suffix form that is obviously related to the President or a president's initials bolded:
George Washington:
Fort Washington
George
Georgetown
George Washington
GW
Washington
Washington cherry tree
Washington, D.C.
Washingtonian
Washingtoniana
Washington County
Washington Parish
Washington's Birthday
John Adams:
Adams County
Adamsville
Thomas Jefferson:
Jefferson
Jefferson City
Jefferson County
Jeffersonian
Jeffersonianism
jeffersonite
Jefferson-Jackson dinner
Jefferson method
Jefferson Parish
James Madison:
Madison
Madison County
Madisonian
Madison Parish
James Monroe:
Monroe County
Monroe Doctrine
Monroeism
Monrovia
John Quincy Adams:
Adams County
Adamsite
Quincy
Andrew Jackson:
Andrew Jackson
Hickory County (from Old Hickory, nickname)
Jackson
Jackson County
Jacksonesque
Jackson Parish
Jacksonville
Jefferson-Jackson dinner
Martin Van Buren:
Van Buren County
(Also, OK is said to have been popularized by "Old Kinderhook", nickname.)
William Henry Harrison:
Harrison County
John Tyler:
Tyler
Tyler County
Tylerism
Tylerize
Zachary Taylor:
Taylor
Taylor County
Millard Fillmore:
Fillmore County
Millard County
Millard Fillmore
James Buchanan:
Buchanan County
Franklin Pierce:
Pierce County
Abraham Lincoln:
Abe
Abraham Lincoln
Abraham Lincoln hat
Honest Abe
Lincoln
Lincolnesque
Lincolnian
Lincolniana
Lincolnite
Lincoln-like
Lincoln Logs
Lincolnomics
Lincoln Parish
Lincoln-Reagan dinner
Lincoln's Birthday
Ulysses S. Grant:
Grant or Ulysses S. Grant or U.S. Grant
Grant City
Grant County
Grant Parish
Grantism
Ulysses
Rutherford B. Hayes:
Hayes County
James A. Garfield:
Garfield
Garfield County
Chester A. Arthur:
Arthur County
Grover Cleveland:
Cleveland County
Benjamin Harrison:
Harrison County
William McKinley:
McKinley County
Mount McKinley
Theodore Roosevelt:
Roosevelt
Roosevelt County
Roosevelt elk
Rooseveltian
teddy bear (from his nickname, Teddy)
Teddy Roosevelt Terrier
TR
William Howard Taft:
Taft
Taftian
Woodrow Wilson:
Wilsonian
Wilsonianism
Warren G. Harding:
Harding County
Calvin Coolidge:
Coolidgean
Coolidge effect
Herbert Hoover:
Hoover blanket
Hoovercrat
Hooverette
Hoover flag
Hoover hog
Hooverian
Hooverism
Hooverite
Hooverize
Hooverizer
Hoovernomics
Hooverville
Hoover wagons
Franklin D. Roosevelt:
FDR
Roosevelt
Rooseveltian
rooseveltite
Harry S. Truman:
Trumanesque
Trumanian
Trumanomics
Dwight D. Eisenhower:
Eisenhowerian
Eisenhower jacket
Ike (from nickname)
John F. Kennedy:
JFK
Kennedyesque
Kennedyite
Kennedyism
Kennedynomics
Lyndon B. Johnson:
Johnsonian
Johnsonism
Johnsonomics
Landslide Lyndon
LBJ
Richard Nixon:
only Nixon could go to China
Nixonette
Nixonian
Nixoniana
Nixon in China
Nixonism
Nixonite
Nixonomics
Nixon shock
Tricky Dick
Jimmy Carter:
Carteresque
Carterian
Carterization
Carterize
Carternomics
Ronald Reagan:
Gipperism (from nickname Gipper)
Gipperite
Gippermania
Lincoln-Reagan dinner
Reaganagram
Reaganaut
Reagan Democrat
Reaganesque
Reaganian
Reaganite
Reaganism
Reaganomics
win one for the Gipper
George H. W. Bush:
Bush 41
Bushie
Bushite
Bushism
bushlip or bushlips
Bushonomics
Bushophile
Bushophilia
Bill Clinton:
Billary
Clintonesque
Clintonian
Clintoniana
Clintonism
Clintonist
Clintonista
Clintonite
Clintonization
Clinton News Network
Clintonoid
Clintonomics
Clintonworld
Clitonista