Namesakes
Nobuo Arai
(m) 1909-1990 
Olympic Medalists 1928 swimming - 4x200 m freestyle relay (silver)
Shigeo Arai
(m) 1916-1944
Olympic Medalists 1936 swimming - 100 m freestyle; swimming - 4x200 m freestyle relay (bronze/gold)
Hirooki Arai
(m) 1988-
Olympic Medalists 2016 50 km walk (bronze)