WordPress get all DB table column value as array

I have register a table on WordPress and assume the table name is my_table and so far it looks like below:

| id | name |
| — | ———- |
| 1 | apple |
| 2 | orange |
| 3 | watermelon |

How do I get all the value from name as an array like below?

$data = array( 'apple', 'orange', 'watermelon');

I have tried the below code but it just show/print the word Array

global $wpdb;

$table_name = $wpdb -> prefix . 'my_table';
$data = $wpdb -> get_results ( $wpdb -> prepare ( "SELECT name FROM $table_name" ) );

echo $data;