foreach $Y (@dependantFiles)
{
    foreach $X (@namedFiles)
    {        
        if(  $X =~ m/\Q$Y\E/i)
        {
            print "Found it\n"
            last;
        }
    }
}

##</code><code>##

foreach $Y (@dependantFiles)
{
    foreach $X (@namedFiles)
    {        
        if (index(lc($X), lc($Y)) >= 0)
        {
            print "Found it\n"
            last;
        }    
    }
}

##</code><code>##

foreach $Y (@dependantFiles)
{
    my $lcY = lc($Y);

    foreach $X (@namedFiles)
    {        
        if (index(lc($X), $lcY) >= 0)
        {
            print "Found it\n"
            last;
        }    
    }
}

##</code><code>##

foreach $Y (@dependantFiles)
{
    my $lcY = lc($Y);

    foreach $X (@namedFiles)
    {        
        if (lc(substr($X, -length($Y))) eq $lcY)
        {
            print "Found it\n"
            last;
        }    
    }
}