According to the U.S. Census Bureau, there are 8 people named Justin Bieber.

The most common band name is "Bliss."

There are 14 different ways of spelling Muhammad

True here they are

Mahmad, Mahamed, Mohamad,Mohamed, Mohammad, Mohammed,Muhamad, Muhamed, Muhamet,Muhammed, Muhammet,Mahammud , Mehmet

The citrus soda 7-UP was created in 1929; '7' was selected after the original 7-ounce containers and 'UP' for the direction of the bubbles.

Not sure about this. It has also been said it is because it originally had 7 ingredients.

The name Wendy was made up for Peter Pan - false

False - see here

Muhammad is the most common first name in the entire world.