The bikini is named after bikini atoll in pacific where america tested an atomic bomb 4 days earlier

Réard named his swimsuit the “bikini,” taking the name from the Bikini Atoll, one of a series of islands in the South Pacific where testing on the new atomic bomb was occurring that summer. Historians assume Reard termed his swimsuit the “bikini” because he believed its revealing style would create reactions among people similar to those created by America’s atomic bomb in Japan just one summer earlier.

http://en.wikipedia.org/wiki/Bikini#History