Martin Waldseemüller, a modernist-humanist German clergyman and cartographer, reprinted “The Four Voyages of Amerigo” in 1507 with his own “Cosmographic Introduction.” He opined:
I see no reason why anyone should justly object to calling this part … America, after Amerigo [Vespucci], its discoverer, a man of great ability.
Waldseemüller included a map of the the new lands, on which the name “America” makes its earliest appearance.
The map was popular. The name caught on, and it stuck.
And it spread. America was first used as a name for only the southern continent of the New World, but Gerardus Mercator’s 1538 world map included both North America and South America.
And that is precisely why many of us live in America instead of Christopha or Columbia. Link