add_filter( 'woocommerce_simple_auctions_displayname', 'auction_mask_displayname' );
function auction_mask_displayname( $displayname ) {

	if ( current_user_can( 'editor' ) || current_user_can( 'administrator' ) ) {
			return $displayname;
	} else {
		$length      = strlen( $displayname );
		$displayname = $displayname[0] . str_repeat( '*', $length - 2 ) . $displayname[ $length - 1 ];
	}
	return $displayname;
}