Funny Scenario that I foresee not gonna happen

This is about 3 girls I know.
First, there's a friend, X whose name I alias as AAAA BBBB CCCC DDDD, which AAAA is her christian name, BBBB is her surname, and the rest is the rest.
Then, this year, there's a coursemate, Y whose name is EEEE CCCC DDDD.
After that, I met a senior,Z whose name is AAAA FFFF.
I wonder what should I call to differentiate them when all 3 of them are around.
But that's not gonna happen, X will only be in Monash at July, Y is leaving Monash, Z is staying in Monash, so basically they won't meet.
And the most important thing, I may not stay in Monash for long, haha