How to get the last category name of a child category?

I’ve finally figured out the result I wanted with get_categories:

get_categories( array(
    'orderby' => 'name',   // get the name of category
    'order'   => 'DESC',   // descending order
    'parent'  => 14,       // category_id
    'number' => 1          // only one category (the last one, because DESC)
));

tech