Not easy to answer, "fame" is time-dependent, and someone who is popular today may not be at the top of the list tomorrow or next year.
For example in the 1950's and 60's Elvis was extremely popular, but today many young people don't even know who he is.
Examples of popular celebrities are:
Gary Glitter
The Beatles
Tom Kenny
Barack Obama
Lady Gaga
The Queen
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Most Popular Barrel Racer is Charmayne James and Lance Graves
The Bible is the most popular book selling over 6 billion copies worldwide.
Tony Hawk. Easy
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