Shigechiyo Izumi
Shigechiyo Izumi (? - 21 February 1986) was a Japanese Centenarian. His case was initially verified by the Guinness World Records who titled him the oldest man ever, but in the 2011-2012 edition he was not mentioned and was replaced with Christian Mortensen.
After a brief hospitalization, he died of pneumonia at 9:15PM (Japanese UTC) on 21 February 1986 at age 120, although some claim his birth certificate belonged to a deceased brother. And his family might have used Shigechiyo as a necronym.
Obituaries were found of a centenarian with the exact same name but born in 1880 instead of 1865.
The oldest undisputed case of male longevity is Jiroemon Kimura, also from Japan, who died on June 12 2013 aged 116 years and 54 days.