The first one is House stark of winter fall, which is a great house of Westeros, and also a  house of the Kingdom of North. Their ruling area is North. 

The house which comes on second is the House Arryn of the Eyrie, this house also comes on the top list, they usually ruled at Vale of Aryan.

House Hoare of Harrenhal house comes in third, this is also a great house. They rule over the Iron Islands and it's an extinct great house.

The fourth house is House Lannister of Casterly Rock. This house is also a great house of Westeros. And this family is one of the richest and most powerful families. 

The house which comes on firth is House Durrandon of Storm’s End, this is a former and great House of Westeros, they ruled over Stormlands.

Sixth house is House Gardener of Highgarden, which is one of the greatest houses of Westeros. They ruled as Kings of the Reach, and the person who found this is known as Garth Greenhand. 

And the Seventh and last one is House Martell of Sunspear, which is also a  great House of Westeros. And their ruling area is the Peninsula of Dorne.

The name of the Seven Kingdoms is given by the formal realm, and the King who ruled this kingdom is King of the Andals and the First Men. 

The Eighth Season's second episode is known as “ A Knight of the Seven Kingdoms which is a HBO's television series, Game of Thrones.  directed by David Nutter 

For many years, The realm has fractured of Civil Warfare in the Kingdom of the North, and also in the Kingdom of the Iron Islands.