Not in the United States. There was a President named Richard Nixon but no James Nixon Richardson.
Richard Nixon
The only president named Richard was Richard Nixon. I do not know about the lion-heart connection. Richard is a common first name in the US.
He named Elvis Presley a federal drug agent http://www.historyking.com/American-History/political-history/richard-nixon/Interesting-Facts-Richard-Nixon.html
Nixon did. Richard Nixon's wife was born Thelma Catherine Ryan, but was better known as Pat Nixon.
Yes, an American Cocker Spaniel.
Several places are named after Richard Milhous Nixon, including Nixon Library and Birthplace in Yorba Linda, California, which is dedicated to his life and presidency. Additionally, Nixon Park in Pennsylvania and Nixon Elementary School in various locations also bear his name. There are several other facilities and streets named in his honor, reflecting his significant impact on American history.
He named Elvis Presley a federal drug agent http://www.historyking.com/American-History/political-history/richard-nixon/Interesting-Facts-Richard-Nixon.html
Flowers
Richard Nixon had two dogs during his presidency: a Cocker Spaniel named Checkers and a Irish Setter named King Timahoe.
Your mum2
The dogs that Richard Nixon had in the White House were Checkers the cocker spaniel, Vicky the poodle, Pasha the terrier, and King Timahoe who was an Irish Setter. Nixon was also the first president to keep fish in the White House.