填空题

How do you feel about your name Would you have chosen it for yourself First names have always been chosen by the parents for the child. It might describe the appearance of the little baby, or express something the parents felt. For example, the name Samuel means in Hebrew "sent by God". As towns grew and many people lived together in the same place, it became hard to tell people apart by their first names. There were too many Johns and Williams and Davids. In Ireland, the letter "O" added to the beginning of a word means "of". So when the Irish wanted to say John, the son of Brian, they made the name "John O’Brian". The Scottish did the same thing, only using "Mac" instead of "O", which meant "son". So John, son of Donald, became known as John MacDonald. There were many other ways in which last names are given. Sometimes the last name came from an informal name, such as Brown, or Longfellow, or Drinkwater. If you could pick your last name today, what would you choose

What does the name "MacDonald" mean（）