Japan 
Japanese triathleteBirthdays by Profession
- Association football player (309)
- Actor (263)
- Seiyū (140)
- Singer (139)
- Politician (134)
- Baseball player (93)
- Composer (63)
- Writer (60)
- Tarento (56)
- Film director (50)
- Screenwriter (48)
- Professional wrestler (48)
- Rikishi (48)
- Novelist (45)
- Athletics competitor (44)
- Military personnel (41)
- Mangaka (38)
- Model (36)
- Samurai (35)
- Singer-songwriter (34)
Birthdays by Region
- Tokyo (314)
- Ōsaka Prefecture (115)
- Kanagawa Prefecture (104)
- Kantō region (94)
- Hyōgo Prefecture (71)
- Chiba Prefecture (69)
- Hokkaidō Prefecture (69)
- Aichi Prefecture (60)
- Kyōto Prefecture (58)
- Shizuoka Prefecture (55)
- Fukuoka Prefecture (51)
- Hiroshima Prefecture (39)
- Okinawa Prefecture (29)
- Kumamoto Prefecture (29)
- Miyagi Prefecture (26)
- Nagano Prefecture (26)
- Tochigi Prefecture (24)
- Ibaraki Prefecture (24)
- Gunma Prefecture (22)
- Yamaguchi Prefecture (21)
Birthdays by Place
- Tokyo (223)
- Saitama Prefecture (54)
- Ōsaka (50)
- Kanagawa Prefecture (37)
- Ōsaka Prefecture (33)
- Kyoto (32)
- Chiba Prefecture (29)
- Yokohama (28)
- Hyōgo Prefecture (28)
- Hokkaidō (27)
- Fukuoka (21)
- Shizuoka Prefecture (19)
- Saitama (17)
- Aichi Prefecture (16)
- Kōbe (16)
- Sapporo (14)
- Chiba (14)
- Hiroshima (13)
- Tochigi Prefecture (12)
- Kumamoto Prefecture (12)
