A human has something like 100,000 hairs on their head. Obviously the hair density across the rest of the body is much lower but let's do a thought experiment: imagine a human with no hair at all. Then, you create an exact copy of the human and add a single hair. You continue making copies and add one more hair each time. You start with the head until it has a regular amount of hair and then you keep going and add more hairs until you have a human where the entire body is covered with hair as dense as on a regular human head.

How many hairs does this take? In an adult human the scalp only accounts for something like 2% of the total surface area. So you would only be able to create about 5,000,000 humans with a different number of hairs on their body before you run out of space. The world today however has roughly 1000 times more humans so there would need to be at least one human whose entire body is covered in hair that is 1000 times denser than the hair on a human head. This is clearly not anatomically possible. Therefore, it's impossible for there to be billions of humans that all have a different number of hairs on their body. Put another way, if there are billions of humans then there must be at least two humans with the exact same number of hairs on their bodies.
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