The initial idioms of the letter S

Sir Arthur John Evans	Sir Arthur Stanley Eddington
Sir Arthur Sullivan	Sir Arthur Travers Harris
Sir Bernard Law Montgomery	Sir Bernard Lovell
Sir Bernard Williams	Sir Charles Leonard Woolley
Sir Charles Scott Sherrington	Sir Charles Spencer Chaplin
Sir Charles Wheatstone	Sir Charles William Siemens
Sir Christopher Wren	Sir Clive Marles Sinclair
Sir David Alexander Cecil Low	Sir David Bruce
Sir David Low	Sir Edmund Hillary
Sir Edmund Percival Hillary	Sir Edward Elgar
Sir Edward Victor Appleton	Sir Edwin Lutyens
Sir Ernst Boris Chain	Sir Francis Bacon
Sir Francis Drake	Sir Francis Galton
Sir Frank Whittle	Sir Fred Hoyle
Sir Frederick Ashton	Sir Frederick Gowland Hopkins