Pronunciation
Pronunciation heavily depends on the language you pronounce ‘y9san9’ in.
When pronouncing ‘y9san9’ globally, you need to omit 9s, so it becomes ‘why-san’ instead.
When pronouncing ‘y9san9’ in slavic languages, it simply translates to ‘ясаня’ or ‘усаня’.
Origin
When coming up with that unique name, I was inspired by LEET, and specifically Russian notation for ‘я’ (read ‘ya’) which is number 9.
y9san9 literally means ‘I am Sanya’ where Sanya is one of the forms for Alex in Russian.