His real name is Hiroshi Fujimoto 藤本弘. His pseudonym is written as: 藤子・Ｆ・不二雄.
Hiroshi Fujimoto and Motoo Abiko used to write together under the pen name of "Fujiko Fujio". After many successful comics (among which the notorious Doraemon), they broke up in 1987. Motoo Abiko continued under the name of "Fujiko Fujio (A)" and Hiroshi Fujimoto under the name of "Fujiko Fujio (F)", later renamed to "Fujiko F. Fujio". He died in 1996.