You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
Let's say that the Americas were called something else. What other names could there be? Obviously a lot of explorer names with -ia placed on the end, but let's see what else we can come up with. I'll kick it off.
Amazonia (for South America)
Atlantis (plausible, IMO. Kinda surprised they weren't called that TBH)
Avalon (if the English are feeling especially romantic)
Columbia/The Columbias (duh)
The Hesperides/North Hesperia, South Hesperia
Terra Nova (if the Latin-lovers are feeling boring)
Occidentia/Occidena (if the Latin-lovers are feeling even more boring)
Vespucia (or, if we're really unlucky) Vespucciland