Alfatihah means

 “the opening”

 it is named the opening as the quran starts with it,

 named alfatihah as well,

 as it is the surah with which prayers are begun,

 surat alfatihah has other names like Ummulkitab

“the mother of the quran”

 it is called Umm Al-Kitab,

 because it contains the meanings of the entire quran.

Surat Alfatihah named

{ Assabualmathany}

  “the seven repeated ayaz”

 as it is repeated many times daily in the prayer and even more is better.

Allah telling the prophet Sallahualihiwasalam in { surat alhijr }

“And indeed, We have bestowed upon you seven of the Mathani and the grand quran” {Alhijr87}

Surat alfatihah is the greatest surah of the quran

 as the prophet sallahalihiwasalam told in different Ahadith.