Japan 
Japanese triathleteBirthdays by Profession
- Actor (345)
- Association football player (268)
- Politician (192)
- Singer (164)
- Seiyū (150)
- Writer (96)
- Baseball player (92)
- Composer (85)
- Film director (78)
- Tarento (70)
- Mangaka (67)
- Novelist (66)
- Singer-songwriter (57)
- Military personnel (56)
- Model (51)
- Screenwriter (50)
- Samurai (44)
- Businessperson (44)
- Swimmer (43)
- Professional wrestler (43)
Birthdays by Region
- Tokyo (414)
- Ōsaka Prefecture (137)
- Kanagawa Prefecture (117)
- Hokkaidō Prefecture (96)
- Fukuoka Prefecture (85)
- Hyōgo Prefecture (85)
- Kantō region (81)
- Kyōto Prefecture (77)
- Chiba Prefecture (76)
- Aichi Prefecture (74)
- Hiroshima Prefecture (50)
- Shizuoka Prefecture (43)
- Niigata Prefecture (38)
- Nagano Prefecture (36)
- Yamaguchi Prefecture (32)
- Ibaraki Prefecture (30)
- Kumamoto Prefecture (28)
- Miyagi Prefecture (27)
- Aomori Prefecture (26)
- Gunma Prefecture (26)
Birthdays by Place
- Tokyo (281)
- Ōsaka (53)
- Kyoto (49)
- Kanagawa Prefecture (39)
- Yokohama (38)
- Ōsaka Prefecture (37)
- Saitama Prefecture (36)
- Hyōgo Prefecture (35)
- Hiroshima (31)
- Hokkaidō (30)
- Chiba Prefecture (28)
- Nagoya (25)
- Fukuoka (25)
- Fukuoka Prefecture (19)
- Aichi Prefecture (18)
- Sapporo (18)
- Kōbe (17)
- Tokyo (16)
- Saitama (16)
- Sendai (16)
