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All over the world, 新井 (Arai , 新井 , Араи , along with others...) is quite a rare unisex first name. The given name 新井 is characteristic of Kazakhstan, where it is quite a rare predominantly feminine, but very seldom masculine name, Cuba, where it is a rare female name, and Indonesia, where it is a rare predominantly male, but scarcely girly name. In absolute terms, it most frequently occurs in China, India, and Indonesia. Likewise, 新井 is the last name as well as the forename.
新井 is also a name for the fictitious and mythical characters: Arai Shakkū , the fictional character from Rurouni Kenshin and Arai Seikū , character in Rurouni Kenshin.