You can use Array.prototype.join (notice the white space after the comma)
<p class="personaType">{{cardData.names.join(', ')}}</p>
This will print all the elements in the array, separated by a comma and a white space.
You can use Array.prototype.join (notice the white space after the comma)
<p class="personaType">{{cardData.names.join(', ')}}</p>
This will print all the elements in the array, separated by a comma and a white space.