A Few days ago I have known surah
Abu lahab rename as
Al-Masad. I don't know why do change the surah name. If any one know that, explain me please.
Surahs can have multiple names. What names is used by a certain person or in a certain publication would depend on convention: the name that they perceive is more familiar to their audience.
Chapter 111 is called تبت (Tabat) from the first word of the first verse, لهب (Lahab) from the fourth word of the first verse and مسد (Masad) from the last word of the last verse.
Some other examples:
Chapter 17 is called الإسراء (Isra) from the 3rd word of the first verse and بني اسراييل (Bani Israel) from the 6th and 7th words of the second verse.
Chapter 41 is called حم السجدۃ (Ha-Meem Al Sajdah) from the disjoint letters of the first verse and فصلت (Fussilat) from the second word of the third verse.
Chapter 76 is called الانسان(Al-Insaan) and الدهر (Ad-Dahr) from the 4th and 7th words of the first verse.