title: How to save a FirstName of a Person efficiently without duplicate entries
body: <p>In my Mysql database, I have a <code>Person</code> table which has a key called <code>FirstName</code>.</p>
  
  <p>If there are 10000s of entries, sometimes there are repeats of common <code>FirstNames</code> of people such as <code>John</code> or <code>Bob</code> etc.</p>
  
  <p>How can I edit the <code>Person</code> table to store the repeats only <strong>once</strong> so that I can utilize memory space and be more efficient at storing data?</p>