on second thoughts, probably best to use this:

my @dependantFiles  = ( 'aa', 'bb', 'cdef' );
my @namedFiles      = ( 'cc', 'bb', 'dde' );
for my $y (  @dependantFiles  ) {
  if( grep /^$y$/i, @namedFiles)  {
    print "Found $y \n";
    last;
  }
  else {
    print "not $y \n";
  }
}
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that way the file 'abc' in @namedFiles won't be tripped up if 'abcd' is in @dependantFiles