RAV-99 is a designation, not a name. It stands for "Radio Active Virus - 99" that was a pandemic on his homeworld when Rav was yet in his mother's womb. His family died from the virus along with countless thousands, but Rav was NICU'ed to health and survived through some miracle experimental treatment.
Even so, growing up, Rav was constantly weak and sick. Moving from orphanage to orphanage and doctor to doctor, he was a medical journal until one day, a new medication was found deep within Xi'an space, and attempted.
[In Memoriam : COVID-19 Dec 2019 - ?? You will never be forgotten]
It reduced Rav's symptoms and allowed him to finally overcome the lasting effects of the Virus. This motivated Rav to explore the Verse, in the hopes of finding new and exciting answers to all of his questions.