England
'Koru konda' is the name of a village. People who originate from this place use it as sir name. It does not signify any particular caste.
my sir name is Avery :) its angalo saxo - English
Dyson orginate from malmesbury in wiltshire , England , UK
sir james caird sponsord him. (im not sure of the spelling of his name)
Sir Churchill's name is Sir Churchill
New Zealand
The name Sidney is of French origin, derived from the Old French place name "Saint-Denis." It traditionally means "wide island" or "from Saint-Denis." Sidney has been used as both a masculine and feminine name and is popular in English-speaking countries. The name gained prominence in the 16th century, partly due to the influence of Sir Philip Sidney, an English poet and soldier.
I'm making a guesstimate on this one. The Tennants had a Clow business partner and that could be the source for his name. If I'm wrong, I'd love to hear the correction.
As an example: Sir Gerald means that a man, whose first name is Gerald, was knighted by the British Monarch. It is an award bestowed by the King or Queen of Britain on a person for services rendered to the Crown or country.
Sir Alan Sugar's full name is Sir Alan Michael Sugar
Sir Edmund Hillary's full name was Sir Edmund Percival Hillary.