Throughout the world, Koa (柯 
, Koa 
, コア ) is a widespread mostly male, but uncommonly feminine first name. The first name Koa is characteristic of China, where it is quite a rare dominantly boy's, but seldom girly name, Japan, where it is quite a rare boy's name, and Cameroon, where it is a rare masculine name. Not in comparison with a country's population, it most frequently occurs in China, Japan, and Indonesia. More frequently, Koa is the last name as well as the forename.