First, values returns a list of values, not just a single value. You're assigning it in scalar context, so what you're getting is the number of values that it would return if you'd used it in a list context. That said, I suspect that values isn't even what you want to be using.

If you do an assignment like this (I can't see the foreach loop you say is working):

$hash{$variable_name}{'fixed name'} = 'val-you';
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...then you can get that value out with the same expression you used in the assignment ($hash{$variable_name}{'fixed name'}).