William Herschel invented the word "asteroid". Various people have named

asteroids as they have been discovered.

The four ateroids names reported by TFAGOPG (The Four Asteroids Group of People Group) says that they are named Meg, Jo, Beth, and Amy. This cluster of asteroids is also called the LW asteroids.

Statistics provided by: TFAGOPG and LW Asteroid Group

Many comets and many asteroids are named, though not all, particulary not all asteroids. As for meteors, as they happen in an instant when a piece of ice, dust, dirt or rock enters the Earth's atmosphere and burns up and then they are gone, they are not named.

Scientists may not have named all of the asteroids in the asteroid belt because there are so many that they are hard to keep track of.

No. There are thousands of asteroids with names.