Two and they were father and son. George and George.
No US presidents were named Nathaniel.
There were 12 presidents from 1950 to 2010 in the US: Truman, Eisenhower, Kennedy, Johnson, Nixon, Ford, Carter, Reagan, Bush, Clinton, Bush, and Obama.
With the possible exception of the recent presidents Clinton, Bush and Obama, there are ships named for every US president . Do a google searce for USS __ and USS president __ to see information about some of them.
One, Lincoln
The four living US ex-presidents are Jimmy Carter, George H. W. Bush , Bill Clinton and George W. Bush.
As of 2018, there have been three US presidents named George. George Washington was in office 1789-1797, George Bush was 1989-1993, and George W. Bush was 2001-2009.
Two: George and George W.
There are currently four former US Presidents alive: Jimmy Carter, George H.W. Bush, Bill Clinton, and George W. Bush.
Bush's Baked Beans (TM) George W. Bush George H. W. Bush P.S. These 2 Presidents are NOT "named after" the baked bean product. There is no direct or indirect relationship between the surnames and the bean product.
Jefferson city
US presidents beginning in 1989 are G.H.W. Bush, Clinton,G.W. Bush and currently Obama.
The US has had two Presidents named George Bush, those being George H.W. Bush and George W. Bush. So you should state which one you are asking about (although they both made similar promises, as indeed all Presidents do, to solve the problems of America).