Japan 
Japanese triathleteBirthdays by Profession
- Actor (303)
- Association football player (284)
- Singer (172)
- Seiyū (151)
- Politician (140)
- Baseball player (103)
- Model (77)
- Composer (72)
- Writer (71)
- Tarento (67)
- Novelist (65)
- Film director (62)
- Military personnel (55)
- Mangaka (55)
- Samurai (50)
- Singer-songwriter (46)
- Professional wrestler (44)
- Screenwriter (38)
- Musician (35)
- Rikishi (35)
Birthdays by Region
- Tokyo (361)
- Ōsaka Prefecture (126)
- Kanagawa Prefecture (120)
- Hyōgo Prefecture (95)
- Hokkaidō Prefecture (81)
- Chiba Prefecture (74)
- Kantō region (72)
- Aichi Prefecture (71)
- Kyōto Prefecture (67)
- Fukuoka Prefecture (59)
- Shizuoka Prefecture (54)
- Hiroshima Prefecture (47)
- Miyagi Prefecture (37)
- Nagano Prefecture (32)
- Gunma Prefecture (31)
- Kumamoto Prefecture (25)
- Gifu Prefecture (23)
- Fukushima Prefecture (23)
- Mie Prefecture (23)
- Okinawa Prefecture (21)
Birthdays by Place
- Tokyo (241)
- Ōsaka (59)
- Kanagawa Prefecture (44)
- Saitama Prefecture (42)
- Kyoto (35)
- Ōsaka Prefecture (32)
- Hyōgo Prefecture (30)
- Hokkaidō (29)
- Chiba Prefecture (28)
- Nagoya (27)
- Yokohama (25)
- Hiroshima (25)
- Kōbe (24)
- Aichi Prefecture (20)
- Fukuoka (20)
- Kyōto Prefecture (20)
- Sendai (18)
- Fukuoka Prefecture (16)
- Chiba (15)
- Kagoshima Prefecture (14)
