MATLAB: How TABLE retreive the variable names

functioninput argumentvariable name

This example from the doc shows table is able to retrieve the variable names of the iput arguments list and uses them as column name:
LastName = {'Sanchez';'Johnson';'Li';'Diaz';'Brown'};
Age = [38;43;38;40;49];
Then
T = table(LastName,Age)
I get
T =
5×2 table
    LastName     Age
    _________    ___
    'Sanchez'    38 
    'Johnson'    43 
    'Li'         38 
    'Diaz'       40 
    'Brown'      49
For
T = table(LastName,Age+1)
I get
T =
    5×2 table
      LastName     Var2
      _________    ____
      'Sanchez'     39 
      'Johnson'     44 
      'Li'          39 
      'Diaz'        41 
      'Brown'
My question is simple: how can do the same (retrieve the variable names) within my own function?
If yes, same question for output arguments:
bar = foo(123);
can foo retrieves 'bar'?
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