By Zesha Saleem Naming a new member of the royal family is a “great responsibility” – so there’s no surprise that their names come with historical meaning. Four days after he was born, Prince Louis’ full name was announced to the world – Louis Arthur Charles. It delighted royal fans everywhere. The announcement on Twitter read: “The Duke and Duchess of Cambridge are delighted to announce that they have named their son Louis Arthur Charles. The baby will be known as His Royal Highness Prince Louis of Cambridge.” There’s a rich meaning behind his name, which is no surprise given that it will be …