| Full Name | Heo Ga-yoon |
| Stage Name | Gayoon |
| Native Name | 허가윤 |
| Birthday | May 18, 1990 |
| Age | 35 years and 1 month old |
| Zodiac Sign | Taurus |
| Birthplace | Seoul, South Korea |
| Height | 5’5″ (165 cm) |
| Weight | 103.6 lbs (47 kg) |
| Blood Type | 0 |
| MBTI | – |
| Education | Dongguk University |
| Languages | Korean, Japanese |
| Group | 4Minute (2009-2016) 2YOON (2013-2016) |
| Social Media | Instagram: [@gayoon_heo] |