If your keys don't have leading or trailing whitespace, you could filter your results like this:

$ perl -Mstrict -Mwarnings -E '
    my $values = [
        { name => "  qwe  ", last => "   rty" },
        { name => "asd   ", last => "   fgh   " },
        { name => "   zxc", last => "vbn   " },
    ];
    say "Raw:";
    say "@{[%$_]}" for @$values;
    say "Filtered:";
    say "@{[%$_]}" for map { { map { /^\s*(.*?)\s*$/; $1 } %$_ } } @$v
+alues;
'
Raw:
last    rty name   qwe  
last    fgh    name asd   
last vbn    name    zxc
Filtered:
name qwe last rty
name asd last fgh
name zxc last vbn
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Update: Originally, the last line of the code above was:

say "@{[%$_]}" for map { { map { /^\s*(.*?)\s*$/; $1 } @{[%$_]} } } @$
+values;
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I wanted the @{[%$_]} construct in the double-quoted string to format the output. I repeated this construct in the map but it's unnecessary: just %$_ (as it is now) is fine.