Save Type Surname (from location) Usage Japanese Scripts 小泉(Japanese Kanji) こいずみ(Japanese Hiragana) Pronounced Pron. KO-EE-ZOO-MEE [key·IPA] Meaning & History From Japanese 小 (ko) meaning "small" and 泉 (izumi) meaning "spring, fountain". A notable bearer of this name is Junichiro Koizumi (1942-), who was Prime Minister of Japan. Categories sizes, water