hide_fname_lname.php

<?php // Do NOT copy this line

/* Copy from below this line */

function pmpro_remove_bfields( $pmpro_required_billing_fields ){

    //remove field ID's from array to make fields required
    $remove_field = array('bfirstname', 'blastname');

    //loop through the $remove_field array and unset each billing field to make it optional.
    foreach($remove_field as $field){
        unset($pmpro_required_billing_fields[$field]);
    }            

    return $pmpro_required_billing_fields;
}

add_filter('pmpro_required_billing_fields', 'pmpro_remove_bfields');

add_action( 'wp_head', 'wp_head_hide_billing_name_field' );
function wp_head_hide_billing_name_field() {
	global $pmpro_pages;
	if ( empty( $pmpro_pages ) || ( ! is_page( $pmpro_pages['checkout'] ) && ! is_page( $pmpro_pages['billing'] ) ) ) {
		return;
	}
	?>
	<style>
		div.pmpro_checkout-field-bfirstname, div.pmpro_checkout-field-blastname {
		display: none;
		}
	</style>
	<?php
}