PHP PDO foreach Statement

I have a PHP PDO Query that runs almost 100%, however, I have one issue I'm not sure how to fix:  
I am querying a Wordpress DB and have used JOIN to go through all of the appropriate tables to get the desired results:
The query:

	$user_id = get_current_user_id();


	$sql = "SELECT
    		p1.ID AS ID,
    		pm1.meta_value AS customer_id,
			oi1.order_item_id AS order_item_id,
			om1.meta_value AS first_name,
			om2.meta_value AS last_name,
			om3.meta_value AS mailing_address
			FROM wp_posts p1
			JOIN wp_postmeta pm1 ON (pm1.post_id = p1.ID AND pm1.meta_key = '_customer_user')
			JOIN wp_woocommerce_order_items oi1 ON (oi1.order_id = p1.ID)
			JOIN wp_woocommerce_order_itemmeta om1 ON (om1.order_item_id = oi1.order_item_id AND om1.meta_key = 'Applicant Information - First Name')
			JOIN wp_woocommerce_order_itemmeta om2 ON (om2.order_item_id = oi1.order_item_id AND om2.meta_key = 'Applicant Information - Last Name')
			JOIN wp_woocommerce_order_itemmeta om3 ON (om3.order_item_id = oi1.order_item_id AND om3.meta_key = 'Applicant Information - Mailing Address')
			WHERE p1.post_type = 'shop_order'";
	

	
	$customer = $pdo->prepare($sql);
 
	// EXECUTE QUERY
	try {
    	$customer->execute();
		$result = $customer->fetchAll();

foreach ($result as $row) {
	$cid = $row->customer_id;
	$fn = $row->first_name;
    	$ln = $row->last_name;
	if ($user_id == $cid) {
    		echo $fn.' '.$ln;
	}
}

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The code grabs all of the Order details from the DB table wp_woocommerce_order_itemmeta.  Lets say there are three orders in the DB, each for a different product.  I'm going to grab each product name and list it out, however, I don't want to list my name three times, I want to echo it out only once.
Does that make sense?  What other info can I offer you to help me fix this issue?