Junichi can be written using different kanji characters. "Ichi" is nearly always written with the character 一 ("one") or its daiji (large numerals) form 壱, while "jun" might be written with a variety of characters, including:
Lieutenant Commander Junichi Sasai ( 笹井 醇一, Sasai Jun'ichi; February 13, 1918 – August 26, 1942) was a Japanese naval aviator and fighter ace of the Imperial Japanese Navy during World War II.