Based on the provided source material, there is no information confirming that Yokoo is a city in Japan. The source identifies Yokoo primarily as a Japanese surname.
Notable individuals with the surname include Kazuko Yokoo, a Japanese diplomat; Kazunori Yokoo, a Japanese actor; and Kaname Yokoo, a Japanese golfer. Other notable figures associated with the name or related variations mentioned in the text include graphic designer Tadanori Yokoo and video game director Yoko Taro.