NAME: الحجر, Al-Hijr.

Name taken from Verse 80 where there is a mention of  “Al-Hijr”.

٨٠  وَلَقَدْ كَذَّبَ أَصْحَابُ الْحِجْرِ الْمُرْسَلِينَ

80  The people of the Rock also rejected the messengers.

But It does not mean that this name is the actual topic discussed in the whole Surah. It is just a reference and mark/symbol to distinguish this Surah from others as is with most other Surahs of Quran. While there are diversified topics discussed in these Surahs.

ENGLISH NAME: The City of Stone. The Rock. 

CHAPTER NUMBER: 15

SURAH HIJR TOTAL VERSES: 99

SURAH HIJR TOTAL WORDS: 657