First, if you want to append a * to the value, it needs to be quoted:
my $name = $k."*";
Second, running that command several times, once for each element in the list, can be veeeeerrrryyyyy ssllllloooooooowwww. Most (all?) platforms' find utilities will let you do something like this ...
my $args = join(" -o ", map { "-name \"$_*\" -print" } @a);
$x = `find . $cmd`;
and do it all in one go. Although obviously at some point you're going to run into command line length limitations.
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