Yes, "Sir" should have a capital letter in a sentence when it is used as a title or form of address, such as "Can you help me, Sir?"
"Sir." He was knighted.
knights usually have the title of "sir" before their name.
Yes. His name did not change. The only difference before and after climbing the mountain is that he received a knighthood which entitled him to use the title "Sir" before his name.
Saint
It is capitalized when it is a title, meaning it comes before a name, but not as a pronoun, where it takes the place of a name. For example in Sir Elton John the Sir is capitalized, but in the sentence, "Hello sir," the sir would not be capitalized.
Sir or Knight
Greek for Peoples Victory
the man who make horse settle
Silver was Sir Galahad, he is the son of Sir Lancelot, who is strangely Shadow, he was given Lancelot's original name before Knighthood.
What is the gentleman's name/What is the gentleman called
You probably mean "surname". Your surname is your family name. For instance, if your name is Mike Hunt, your "surname" is Hunt.