Answer 1:
This is impossible to answer because we don't
have a clear definition of what a "person" is.
There are a number of extinct species of
human-like animal, much more like us than like any
other living thing today. However, they weren't
the same as us. Were they other species of
humans? Or were they human-like apes but not
humans? This is a language question, not a
science question.
The other parts of your question can't be answered
either. If the first human didn't have language,
then she/he did not have a name. If she/he did
have language, then she/he probably did have a
name, but we have no way of knowing what that name
was (it probably wasn't "Adam").
The last common ancestor between humans and our
closest living relative (chimpanzee) is about 5-7
million years ago. Therefore the first human must
have been younger than that. The last common
ancestor of all living humans is about 50 thousand
years ago, so the first human must have been older
than that. Besides those limits, it comes down
to language.
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