Get ( AccountName )
Create new table containing Account name and corresponding Name and Surname.
Create a new calculation field User=Get(AccountName) [find, please, correct function, I'm writing as I rememmber
Link to existing table via relationship User=Account name.
Insert Name-Surname in existing table from new table.
Get(AccountName) very useful to show only This User records
I am pretty sure this is what I am looking for. However, I am not sure what you mean by the step "insert Name-Surname" in existing table from new table.