Brunette Girl Reveals Outside With A Sword And Knight's Armour

In the British honor system the knightly style of Sir is accompanied by the given name, and optionally the surname. So, Elton John may be called Sir Elton or Sir Elton John, but never Sir John. Similarly, actress Judi Dench DBE may be addressed as Dame Judi or Dame Judi Dench, but never Dame Dench.
Wives of knights, however, are entitled to the honorific "Lady" before their husband's surname. Thus Sir Paul McCartney's ex-wife was formally styled Lady McCartney (rather than Lady Paul McCartney or Lady Heather McCartney). The style Dame Heather McCartney could be used for the wife of a knight; however, this style is largely archaic and is only used in the most formal of documents, or where the wife is a Dame in her own right (such as Dame Norma Major, who gained her title six years before her husband Sir John Major was knighted). The husbands of Dames have no honorific, so Dame Norma's husband remained John Major until he received his own knighthood.
Since the reign of Edward VII a clerk in holy orders in the Church of England or in another Anglican Church has not normally received the accolade on being appointed to a degree of knighthood. He receives the insignia of his honor and may place the appropriate letters after his name or title but he may not be called Sir and his wife may not be called Lady. The Rt Revd the Hon Sir Paul Reeves did receive the accolade and is correctly called Sir but it is not clear how this situation arose. Ministers of other Christian Churches are entitled to receive the accolade. For example, His Eminence Sir Norman Cardinal Gilroy did receive the accolade on his appointment as Knight Commander of the Most Excellent Order of the British Empire in 1969. A knight who is subsequently ordained does not lose his title. A famous example of this situation was The Revd Sir Derek Pattinson, who was ordained just a year after he was appointed Knight Bachelor, apparently somewhat to the consternation of officials at Buckingham Palace. A woman clerk in holy orders may be appointed a Dame in exactly the same way as any other woman since there are no military connotations attached to the honour. A clerk in holy orders who is a baronet is entitled to use the title Sir.
Outside the British honours system it is usually considered improper to address a knighted person as 'Sir' or 'Dame'. Some countries, however, historically did have equivalent honorifics for knights, such as Cavaliere in Italy (e.g. Cavaliere Benito Mussolini), and Ritter in Germany and the Austro-Hungarian Empire (e.g. Georg Ritter von Trapp).