nikaose

<?php
$sum = [];
foreach($arr as $row)
{
    if(!isset($sum[$row['Name']]))
    {
        $sum[$row['Name']] = [
             'Name' => $row['Name'],
             'Stars' => 0,
        ];
    }

    $sum[$row['Name']]['Stars'] += $row['Stars'];
}
$sum = array_values($sum);

print_r($sum);