Do you mean the Field Key?
If so you could use
get_field_object instead of the normal get_field.
For example, this will display all related information from our field:
<?php $myfieldname = get_field_object(myfieldname); ?>
<pre><?php print_r($myfieldname) ?></pre>
And this will display the Field Key from the above:
<?php echo $text[key]; ?>
We can skip all the above and do it in one line, on it’s own like this:
<?php echo get_field_object('text')[key]; ?>
