Not an explanation, but...
Posted by The Mysterious H.C. on June 20, 1998 at 18:01:53:
In response to Addressing a 'Sir'!, written by MariaH on June 20, 1998 at 10:34:00
] A 'Mr' was always referred to by his surname, and any ranks of peerage after that by what they held (right?), so why are 'sirs' addressed differently?
Not sure "why", but there's a tabulation at http://www.pemberley.com/janeinfo/honrific.html
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