Herbert Hoover who believed in the "Efficiency Movement" ; see related link below .
herbert hoover herbert hoover
James Buchanan ,15th President , was "old buck"- a natural nickname for Buchanan.
Herbert Hoover's nickname was The Chief. :)
Franklin Delano Roosevelt. The 32 president of the United States. Rest in Peace FDR.
Grover Cleveland, whose birth name was Stephen Grover Cleveland, was known as "Big Steve" as a boy.
"Bubba" was the nickname for President Bill Clinton.
Maybe you mean Lemonade Lucy? The wife of President Hayes would not allow any alcohol in the White House.
General Dwight Eisenhower who later became President of the US.
It was a Vice President, rather than a President, who had the nickname The Happy Warrior. The nickname belonged to Hubert Humphrey, the 38th Vice President of the United States.
I can find no record that any US President had this nickname.
Malayalam movie actor Mammootty's nickname is Mammookka.
Abraham Lincoln had the nickname of Honest Abe.
If you meet him, the only polite address is Mr. President or President ____. However, in talking about the president, he is often called by just his last name , initials or a nickname and I see nothing at all impolite at that.