Explanation

The word "kahf" means "the cave in the mountain"

the sura is named "kahf" because it speaks about the story of the Companions of the Cave

Qitmeer is the name of the dog in Surah Kahf.

while

The cave of Ashab e Kahaf is located in Jordan.

Ashab e Kahf slept for 309 years

The number of Ashab-e-Kahf was 7

The story of Ashab al-Kahf is narrated in the eighteenth chapter of the Quran, called “al-Kahf”  In verses 9-26