Princess Diana's full name was Diana Frances Spencer. At the time of her death, she was referred to as Diana, Princess of Wales; she in fact was not given the title "Princess" alone.
Diana is often referred to as Lady Diana Spencer rather than Diana, Princess of Wales, due to the tradition of referring to deceased women by their maiden name and title.
ANSWER
1. She got her title "Princess" from marrying his royal highness Prince Charles. Her birth name "Diana Frances Spencer" was given to her from her mother and father. When she got married she had it changed to Windsor then her majesty Queen Elizabeth had the UK Sovereign change it to Wales,
She died at age 36 on the 31st of august 1997.
Princess Diana's middle name was Frances.Frances
Princess Diana of Themyscira or Diana Prince
Princess Diana's last name before her marriage to Prince Charles was Spencer.
Ghinea Diana's birth name is Diana Ghinea.
Gennaro Diana's birth name is Gennaro Diana.
Diana Canova's birth name is Rivero, Diana.
Diana Castle's birth name is Diana Szlosberg.
Diana Tenes's birth name is Diana Rodriguez.
Diana Vreeland's birth name is Diana Dalziel.
Diana Sinden's birth name is Diana Mahony.
If you mean was Princess Diana short for something? then yes it was short for Diana, Princess of Wales. If you mean is there a shorter name for Princess Diana? then some people called her Princess Di.
Princess Diana's middle name was Frances.