Web Reference: Sir is a formal honorific address in English for men, derived from Sire in the High Middle Ages. Both are derived from the old French " Sieur " (Lord), brought to England by the French-speaking Normans, and which now exists in French only as part of "Monsieur" lit. 'my lord'. The meaning of SIR is a man entitled to be addressed as sir —used as a title before the given name of a knight or baronet and formerly sometimes before the given name of a priest. You use the expression Dear Sir at the beginning of a formal or business letter or email when you are writing to a man. You use Dear Sirs when you are writing to an organization.
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Net Worth Profile Overview
Sir Derek Jacobi In Conversation Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
Estimated Worth: $58M - $90M
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Last Updated: April 5, 2026
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