How to name elements inside nested blocks?

[aaty2020]

How do you name the elements inside your nested blocks? Should you put the name of the parent block class as a prefix or the name of a higher block class? For example, in the code below, how should you name the element p (block1__elemanname or block2__elementname )?

<div class="block1">
  <div class="block2">
    <p class="?__elementname"></p>
  </div>
</div>