How to return name of an array not it's contents?

Hey there, thanks for checking this. I have an array that holds some other arrays and I want to return just the name of the arrays that it holds, not their contents. In this example I want to trace the string “myDays_ar” but can only get the contents.
[AS]
var myDays_ar:Array = [“Sat”, “Sun”, “Wed”];
var myMonths_ar:Array = [“January”, “July”];
var my_ar:Array = [myDays_ar, myMonths_ar];
trace(my_ar[0]);
//RETURNS: Sat,Sun,Wed
[/AS]
I have tried
[AS]
trace(my_ar[0]._name);
[/AS]
and
[AS]
trace(my_ar[0]._name.toString());
[/AS]
but can’t get what I want!
If anyone could help I would be really grateful:)
Thanks!
Schm