What great names! Of course maybe not what I would name a child, but very clever! When the baby comes, you should address a card to Yiyi or Astro for fun.. Also record this event. Your daughter will enjoy this story if she ever becomes a parent.
This is a teaching moment. Remind your daughter that when we are asked our opinion it is good to share, but to remember, that does not mean that the person has to accept it. It does not make the suggestion bad or wrong, but that the other person gets to decide what they want.. Also encourage her not to be hurt if others laugh, instead have her ask the "laughers", what was so funny?
Little girls have to know that their opinions are important. Not just cute. Give her credit for being creative and clever. Encourage her opinions and then explain how decisions are made based on suggestions.. Give her choices. Make some of them so over the top, that she will question why you would suggest that.. When she makes decisions praise her and ask her why she chose that as her choice. I think you have a very special child.