sur: In the Old Testament this word in Ge 43:20 the King James Version ('adhon) is changed in the Revised Version (British and American) into "my lord." In the New Testament the word sometimes represents aner, as in Ac 7:26; 14:15; 19:25, etc.; more frequently kurios, "lord," as in Mt 13:27; 21:30; 27:36; Joh 4:11,15,19,49 (the Revised Version margin "lord"); Joh 20:15. In Re 7:14, the Revised Version (British and American) renders "my lord."
⇒See the definition of sir in the KJV Dictionary