Makkah, the birthplace of Prophet Muhammad (peace be upon him) and the holiest city in Islam, is mentioned in the Quran with six different names:

1. Bakkah: This name is derived from the Arabic word "bakka," which means "a place of gathering" or "a valley." It is believed to refer to the fact that Makkah was a place where people from different tribes and cultures would gather for trade and pilgrimage.

2. Umm al-Qura: This name means "mother of cities" or "the most populous city." It is used to emphasize the importance and significance of Makkah as a religious and cultural center.

3. al-Balad: This name simply means "the city." It is used to refer to Makkah in a general sense, without specifying any of its particular characteristics.

4. al-Haram: This name means "the sacred city" or "the sanctuary." It is used to emphasize the sanctity of Makkah and its role as a place of worship and pilgrimage.

5. al-Masjid al-Haram: This name means "the sacred mosque." It is specifically used to refer to the Kaaba, the cube-shaped structure that is the central focus of Islamic worship.

6. al-Mash'ar al-Haram: This name means "the sacred place of assembly." It is used to refer to the location of Mina, a valley near Makkah that is visited by pilgrims during the Hajj pilgrimage.

These six names reflect the different aspects of Makkah's significance, from its historical and cultural importance to its religious and spiritual importance. They also serve as a reminder of the city's unique place in the hearts of Muslims around the world.