Japan 
Japanese triathleteBirthdays by Profession
- Association football player (132)
- Actor (41)
- Politician (36)
- Baseball player (28)
- Seiyū (24)
- Singer (19)
- Writer (16)
- Mangaka (14)
- Swimmer (12)
- Film director (12)
- Rikishi (11)
- Tarento (10)
- Composer (10)
- Professional wrestler (10)
- Military personnel (10)
- Shogi player (9)
- Businessperson (9)
- Screenwriter (9)
- Association football manager (9)
- Samurai (8)
Birthdays by Region
- Tokyo (101)
- Hokkaidō Prefecture (28)
- Ōsaka Prefecture (27)
- Chiba Prefecture (24)
- Kanagawa Prefecture (22)
- Hyōgo Prefecture (20)
- Shizuoka Prefecture (17)
- Hiroshima Prefecture (16)
- Kantō region (15)
- Kyōto Prefecture (14)
- Aichi Prefecture (12)
- Kumamoto Prefecture (9)
- Niigata Prefecture (8)
- Ibaraki Prefecture (8)
- Gifu Prefecture (8)
- Tochigi Prefecture (8)
- Fukuoka Prefecture (8)
- Mie Prefecture (7)
- Nagano Prefecture (6)
- Miyagi Prefecture (6)
Birthdays by Place
- Tokyo (61)
- Chiba Prefecture (10)
- Kyoto (9)
- Hiroshima (9)
- Hokkaidō (9)
- Kanagawa Prefecture (9)
- Shizuoka Prefecture (8)
- Saitama Prefecture (8)
- Ōsaka (8)
- Aichi Prefecture (6)
- Hyōgo Prefecture (6)
- Sapporo (6)
- Tokyo (5)
- Suginami-ku (5)
- Shizuoka (5)
- Sakai (4)
- Tochigi Prefecture (4)
- Fukuoka (4)
- Kumamoto (4)
- Ōsaka Prefecture (4)
