Determining the "first born" on Earth depends on the context: religious beliefs, scientific understanding, or fictional narratives.
Religious Perspectives
Many religions have creation myths that describe the first humans. These accounts differ considerably:
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Abrahamic Religions (Christianity, Islam, Judaism): These faiths generally believe Adam was the first man, created by God, not born. Adam - Wikipedia provides details. Eve was subsequently created and together they were the progenitors of humanity. First Baby In The World references Cain and Abel as their firstborn children.
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Hinduism: In Hinduism, Manu is considered the first man. He was not born but is seen as the ancestor of humankind.
Scientific Perspective
Scientifically, there's no single "first born." Homo sapiens, the modern human species, emerged gradually in Africa approximately 200,000 years ago. The process was evolutionary, and there wasn't a specific individual who can be identified as the "first." The gradual emergence of Homo sapiens is well documented through fossil evidence and genetic studies. How was the first human born? further explains this process.
Fictional Narratives
Many fictional works feature characters described as "first born," often with significant mythological or supernatural implications. For example, DC Comics features a character called "First Born," son of Zeus and Hera. First Born (Prime Earth) | DC Database | Fandom
In conclusion, there's no single definitive answer to "Who is the first born on Earth?" The answer varies dramatically depending on whether one adopts a religious, scientific, or fictional perspective.