Sumii From Wikipedia, the free encyclopedia Sumii (written: 住井 or 角居) is a Japanese surname. Notable people with the surname include: Katsuhiko Sumii (角居 勝彦, born 1964), Japanese horse trainer Sue Sumii (住井 すゑ, 1902–1997), Japanese social reformer, writer, and novelist Characters Yuya Sumii (角居 裕也, Sumii Yūya), a fictional character from Kamen Rider Gaim; see List of Kamen Rider Gaim characters See also Search for "Sumii" on Wikipedia. All pages with titles beginning with Sumii All pages with titles containing Sumii Sumi (disambiguation) Sumie (disambiguation) Surname listThis page lists people with the surname Sumii. If an internal link intending to refer to a specific person led you to this page, you may wish to change that link by adding the person's given name(s) to the link. Related Articles~TimelinesTop QsFact Checks