Override exposed filter dropdown values
Implementing hook_form_alter() alone is not enough. The View query will check the taxonomy by term id. Now you just altered it to title in the dropdown values.

You would then need to implement hook_views_query_alter() and alter the query condition as your need. Assuming you have a taxonomy term field field_cat, your view query will have the following similar condition - field_data_field_cat.field_cat_tid = {the_selected_value}


Now, you need to check it against taxonomy_term_data.name:

function MYMODULE_views_query_alter(&amp;$view, &amp;$query){
    if($view-&gt;name == 'your_view_name'){
        $conditions = $query-&gt;where[1]['conditions'];
        $k = 0;
        foreach($conditions as $cnd){
            if($cnd['field'] == 'field_data_field_cat.field_cat_tid'){
                $replaced_condition = array(
                    'field' =&gt; 'taxonomy_term_data_field_data_field_cat.name',
                    'value' =&gt; $cnd['value'],
                    'operator' =&gt; $cnd['operator']
                );
                $query-&gt;where[1]['conditions'][$k] = $replaced_condition;
                break;
            }
            $k++;
        }
    }
}


Hope this helps.