选择下拉框中的隐藏ID

I am working on another project that calls for a dropdown box to be populated with Salesman names. I have setup the database to pass the id around, as opposed to the salesman's name. I want to know if there is a way to include a "hidden" column within a dropdown box, and call the id as opposed to the name.

There could possibly be salesman with the same first and last name, so I can't use a UNIQUE column to help (by using jQuery to re-query the database based on name.

I'm open to suggestions if there might be a more appropriate way to do this. Thanks in advance!

function getSalesmen() {
include 'scripts/mysql_login_pdo.php';

$query = "SELECT `id`, `fname`, `lname` " .
        "FROM `users` " .
        "ORDER BY `fname` ASC";

$statement = $db->prepare($query);
$statement->execute();

$salesman = '';

while ($row = $statement->fetchObject()) { 
    $fname = $row->fname;
    $lname = $row->lname;

    $salesman .= '<option>';
    $salesman .= $fname . ' ' . $lname; //This is where I'd like the ID to somehow be handled
    $salesman .= '</option>';
}
$db = null;
return $salesman;
}

Relevant section of index.php-

<li>
    <form method="post">
    <ul>
        <li>Salesman</li>
        <li><select id="salesman" name="salesman"><?php print getSalesmen(); ?>   </select></li>
        <li>Status</li>
        <li><select><?php print getStatus(); ?></select></li>
        <li><button type="button" id="search_a" name="search_a">Search</button><br />
            <button type="button" id="fill_all_a" name="fill_all_a">All Assigned Leads</button></li>
    </ul>
    </form>
</li>