Yokoi is Japanese surname. Notable people with the surname include:
Gunpei Yokoi, designer of the Game Boy and other Nintendo products Hirotaka Yokoi, professional mixed martial arts fighter Lilly Yokoi (1929–2026), Japanese American bicycle acrobat Mitsuo Yokoi, a Japanese voice actor (known as "Tesshō Genda") Shoichi Yokoi, soldier and celebrity Yokoi Shōnan, political reformer Yokoi Yayū, 18th-century poet