Multiple values in shortcode

So, following is used in a shortcode: [my_shortcode dfd_name="Steve"]

if(strstr($key, 'dfd'))
                $metaquery[] = array(
                        'key' => $key,
                        'value' => $val,                            
                        'compare' => 'LIKE',
                        'terms' => explode(",",$val)

However, I am trying to make it so that I can put multiple values in the dfd_name like the following: [my_shortcode dfd_name="Steve, Mike"], but it is not working in terms of the multiple values. It picks up as “Steve, Mike” as one word. What am I doing wrong?

Source: shortcode

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