Martha Dandridge Custis Washington was the wife of George Washington, the first president, and her first name, as you can probably infer, was Martha.
Michelle Obama
Michelle Obama
The new First Lady of the US will be Michelle LaVaughn Obama whose maiden name was Michelle Obama.
Elanor Roosevelt
There is no salary for the first lady.
Michelle Obama is the first lady of the US as of 2009.
Hilary (Clinton) is probably the name you are looking for.
If you mean first ever, first lady, it would have been Martha Washington
Such was Ladybird Johnson's name.
Honorable First Lady of The United States:
No, the First Lady does not have her own dedicated plane.
Currently (in December 2015), the First Lady is Michelle Obama; she is the first woman of color in US history to be First Lady. When her husband Barack Obama's term as president ends, the US will have a new president and a new first lady---or if a woman wins, we will have a First Gentleman.