Sierra Onyx is an Australian model on Instagram and OnlyFans. Her exact date of birth is unknown, however she suggested on Instagram she was born in the year 2000. Sierra Onyx is also not her real name. She does “gaming and stuff”. She recently had rhinoplasty. As of September 2024, Sierra has amassed 524,000 followers on her Instagram platform. As of 2025, Sierra deleted all of her online presence, except for her TikTok which is inactive.