Japan 
Japanese triathleteBirthdays by Profession
- Association football player (558)
- Actor (243)
- Baseball player (144)
- Politician (127)
- Seiyū (122)
- Singer (106)
- Writer (69)
- Composer (64)
- Novelist (59)
- Mangaka (53)
- Tarento (50)
- Samurai (48)
- Rikishi (45)
- Military personnel (44)
- Film director (43)
- Screenwriter (40)
- Model (40)
- Athletics competitor (39)
- Swimmer (39)
- Professional wrestler (34)
Birthdays by Region
- Tokyo (393)
- Ōsaka Prefecture (150)
- Kanagawa Prefecture (129)
- Hokkaidō Prefecture (101)
- Hyōgo Prefecture (93)
- Chiba Prefecture (86)
- Kantō region (83)
- Shizuoka Prefecture (71)
- Kyōto Prefecture (68)
- Aichi Prefecture (61)
- Fukuoka Prefecture (59)
- Hiroshima Prefecture (53)
- Nagano Prefecture (29)
- Kumamoto Prefecture (29)
- Miyagi Prefecture (28)
- Ibaraki Prefecture (28)
- Tochigi Prefecture (27)
- Nara Prefecture (23)
- Niigata Prefecture (23)
- Ehime Prefecture (23)
Birthdays by Place
- Tokyo (270)
- Ōsaka (49)
- Kyoto (49)
- Kanagawa Prefecture (46)
- Ōsaka Prefecture (46)
- Hokkaidō (44)
- Saitama Prefecture (41)
- Hyōgo Prefecture (37)
- Yokohama (34)
- Chiba Prefecture (33)
- Shizuoka Prefecture (30)
- Hiroshima (27)
- Aichi Prefecture (20)
- Kōbe (19)
- Fukuoka (18)
- Fukuoka Prefecture (17)
- Saitama (16)
- Nagoya (16)
- Chiba (15)
- Sapporo (14)
