Getting key value of WP_Term object in wordpress

How I can get from php on wordpress to a value of WP_Term object. I am using the next code to get the object:

$queried_object = get_the_category( get_queried_object_id());

But this return an Array like this.

Array
(
    [0] => WP_Term Object
        (
            [term_id] => 12
            [name] => Argentina
            ...
        )

)

How I can get only the value for [name] key in this object from php in wordpress?

It returns an array because Posts can have multiple categories. You just need to get the item from the array whose name you want, ($queried_object[0] for the first one), then get the value out of that the same way you would any PHP object:

$name = $queried_object[0]->name;

You should probably include some checks to make sure the post has a category before attempting to use the array or object like this:

$categories = get_the_category( get_queried_object_id() );

if ( ! empty( $categories ) ) {
    $category = $categories[0];
    $name = $category->name;
}