PHP - Excluding A Category From A List

Hello, I need to hide products with same title from WooCommerce shop page and i'm trying to achieve that with a custom loop.

For example i have 5 products called "Plex" and the only diferrence between them is the SKU field and the color. I don't care which of the same product will be displayed in the shop page, i just want to display only one of all these products.

I created a loop which is working and does hide products with same name but i have a problem. If i set posts_per_page=8 it shows less because it counts the hidden products also.

$args = array(
   'post_type'         => 'product',
   'posts_per_page'    => 8
);
$query = new WP_Query($args);
$list = array();

while ($query->have_posts()) : $query->the_post(); 
if(in_array(get_the_title(), $list)){ continue; }
   $list[] = get_the_title();
?>

<li><?php wc_get_template_part( 'content', 'product' ); ?></li>

<?php endwhile;
wp_reset_postdata();

P.S. I don't want to remove these products, i just want to hide them from shop loop!

Any ideas what is the problem with the loop? Is there a better way to achieve that?

<?php
// Establish SQL Connection.

$mysqli			=	mysqli_connect( $sql['host'], $sql['user'], $sql['pass'], $sql['db'] ) or die( "DARN");
$query			=	$mysqli->query( "SELECT * FROM folders ORDER BY name ASC" );
$num_rows	=	$query->num_rows;


echo "Found <b>" . $num_rows . "</b> row(s) in the database!<br>";


	while ( $row = mysqli_fetch_array( $query ) )
	{
		// DO NOT REMOVE
		$id		=	$row['id'];
		$name	=	$row['name'];
		$parent	=	$row['parent'];
		
		/***************************************************************************************************/
		
		if ( $parent == 0 )
		{
			echo $id . " " . $name . " " . $parent . "<br>";
			
			$query2	=	$mysqli->query( "SELECT * FROM folders WHERE parent = " . $id . " ORDER BY name ASC" );
			
			while ( $row2 = mysqli_fetch_array( $query2 ) )
			{
				echo "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;" . $row2['name'] . "<br>";
			}
		}
	}
?>

An array of "categories" is given:

    $categories = array(
        array("id" => 1, "title" => "Pants", "children" => array(
            array("id" => 2,
                "title" => "Boots",
                "children" => array(
                    array("id" => 3, "title" => "Leather"),
                    array("id" => 4, "title" => "Textile"),
                ),
            ),
            array("id" => 5, "title" => "Sneakers"),
        ),
        ),
        array(
            "id" => 6,
            "title" => "Sort",
            "children" => array(
                array(
                    "id" => 7,
                    "title" => "Balls",
                ),
            ),
        ),
    );

I need to write a function searchCategory ($categories, $id) that returns the name of the category by the category ID.

Help me please.