The Royal Family are granted their own personal coat of arms, based on the Royal Arms which features a shield divided into four quarters. The quarters represent the symbols of Ireland, England, and Scotland.
Wales is not represented in the Royal Arms because by the time of the Act of Union in 1707, Wales was already integral to England.
Each royal coats of arms are unique and personable to each member of the royal family.
Kate, Duchess of Cambridge’s coat of arms depict the arms of her husband (Prince William, the Duke of Cambridge) impaled with those of her father, Michael Middleton.
Princess Diana was honoured a coat of arms ahead of her wedding to Prince Charles in 1981. The crest encompassed her family name Spencer, meaning those in her direct family could use the crest.
Prince Philip’s coat of arms represents his lineage as Prince of Greece and Denmark on his paternal side, and the Mountbatten family arms in honour of his maternal family line.
Meghan Markle, Duchess of Sussex’s coat of arms features wintersweet flowers, which grow at Kensington Palace. It also features a songbird, symbolising the “power of communication”, and it has been joined with Prince Harry’s royal lion Coat of Arms, as is protocol for royal wives.
Source : EXPRESS