Well, Prince Namor is from Atlantis. He comes from a union between an Atlantean princess and a human sea captain. This makes him a half - human, half - Atlantean. His origin gives him some amazing powers. He can breathe underwater, which is a natural ability for Atlanteans. But he also has enhanced strength and durability that are above what a normal Atlantean might have. His origin story is important as it shapes his view of both the surface world and Atlantis. He often finds himself in the middle of conflicts between the two. His story is full of battles, political intrigue within Atlantis, and attempts to find his place in a world that doesn't fully accept him because of his mixed heritage.
Namor isn't Asian in the comics. His character has been established with a specific ethnicity and origin that's not Asian. This has been consistent throughout the comic series.
Namor wasn't Mayan in the comics. His character has a distinct and established backstory that doesn't involve being Mayan. Usually, his heritage and roots are presented in a specific way within the comic universe.