The Leo constellation has many bright stars, but there isn't a definitive "9 main names". However, here are some of the most prominent stars in Leo, and why they are important:

Brightest Stars:

* Regulus: The brightest star in Leo, also known as Alpha Leonis. It's a blue-white star, marking the heart of the lion.

* Denebola: The second brightest, also called Beta Leonis, marking the lion's tail.

* Algieba: A double star (Gamma Leonis) marking the lion's mane.

* Zosma: Another prominent star (Delta Leonis) in the lion's hindquarters.

Other Important Stars:

* Adhafera: (Zeta Leonis), a triple star system in the lion's mane.

* Chort: (Theta Leonis) a giant star.

* Rasalas: (Epsilon Leonis), a double star near the lion's tail.

* Subra: (Mu Leonis) a binary star system.

There are many other stars in Leo, but these are the most commonly recognized and named. You can find more information on their specific characteristics and history through online star catalogs or astronomy resources.