Caribe.
Voted other. I use both forms depending on mood, and what word it's paired against.
I think the more important question is, how do you pronounce amphibian?
Is it am-fib-ee-an or am-fib-ian
Maybe the first pronunciation in the poll is used more when referring to the locale, the other referring to the people?
CA-RIB-e-yan or Car-ih-BEE-yan
Depends on the context, although generally the first.
From M-W.com:
\ˌker-ə-ˈbē-ən, ˌka-rə-, kə-ˈri-bē-ən\