Beginners: Welcome warm up game for a group of 12

The teacher holds a ball (in our case it was a yellow ball with a smiley printed on it).

She holds it up and says "My name is Anna." Then she looks at someone and says "What is your name?" Then that person catches the ball and holds it up. "My name is Peter" he says. Then he looks at someone else: "What is your name?" he asks and throws them the ball.