I'm American, but so far the UK posters seem to be unaware that Ralph is pronounced "RAYF" in Gilbert & Sullivan's
H.M.S. Pinafore (1878). Another example is English composer Ralph Vaughan Williams (his name is pronounced "RAYF"). I've always heard that "RAYF" is the traditional/older/posh English pronunciation.
ETA: I just thought of another example, Ralph Nickleby from Dickens'
Nicholas Nickleby. His name is pronounced "RAYF" in the 1977 BBC television serial. However, it is pronounced "RALF" in the TV version of the play,
The Life and Adventures of Nicholas Nickleby (1982).
This message was edited 10/17/2011, 6:39 PM