the name of Zuzik

As good as I know- Zuzik is a nickname for Zusia, and that was his real name!
so perhaps to be correct one should write: Zusia (Zuzik) Guzner

Reuvena (Ruvi)

Should I change Zuzik's official name on the tree??? from Zuzik to Zusia? Comments?

I think it should be Zuzik (Zusia) or vice verca