Many people with distinct family names in Japan, including:

Japanese name

Izumi Sakai, a J-pop singer, song writer, and member of the group Zard

Saburo Sakai, a Japanese fighter ace during World War II

Sakai, Osaka, a city in Osaka Prefecture

Hiroyuki Sakai, a Japanese chef

Sumie Sakai, a Japanese-American professional wrestler

Takashi Sakai, a General of the Imperial Japanese Army during World War II

Sakai Project

Noriko Sakai, a J-pop star and actress

Sakai (tribe), an indigenous people of the Malay Peninsula

Sakai, Fukui, a city in Fukui Prefecture

Stan Sakai, a Japanese-American comic book creator

Masaaki Sakai, a Japanese rock musician and television performer

Sakai clan, a Japanese clan

Sakai, Fukui (town), a former town and current neighborhood in Sakai, Fukui

Sakai, Ibaraki, a town in Ibaraki Prefecture

Sakai, Gunma, a former town in Gunma Prefecture

Sakai, Nagano, a village in Nagano Prefecture