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In all the world, Koizumi (コイズミ , 小泉 , Koizumi ) is quite a common dominantly boy's, but seldom female first name. The first name Koizumi is characteristic of China, where it is a rare mostly male, but uncommonly girly name, Japan, where it is a very rare masculine name, and Indonesia, where it is a very rare feminine name. Much less frequently, Koizumi is the last name as well as the forename.
Koizumi is also a name for the fictitious and mythical characters: .