Which star is called the Morning Star?

No star is called the Morning Star. It is just the planet Venus. It is sometimes also known as the Evening Star. When it can be seen, it usually seen just after sunset and just before sunrise and is very bright as it reflects sunlight. Venus is nearer to the Sun than we are, so it follows or precedes it. People who don't know all that often think Venus is a star when they see it, and because of when they see it, it has been referred to by the names Evening Star and Morning Star.