How can I add PHP code to allow users to add favorite names?

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SQL

PHP

MySQL

table

So i have a table named: BabyNames
I have attributes: BoyNames, GirlNames, UserID and Favourites - i have added the last two in so I can add a favorite option

On my php script, there is script in which allows user to select a letter and it displays the baby names related

I also want them to have a favorite button so they can store some of their favorite names

Can someone help me out? with both SQL and PHP code. Do i need to assign an ID to the boy and girl names?

See below PHP at present.

What I have tried:

if (isset($_GET["initial"])) {
      $initial=$_GET["initial"];
      $dbQuery=$conn->prepare("select * from BabyNames Where BoyNames like :initial AND GirlNames like :initial");
      $initial=$initial.'%';
      $dbParams=array('initial'=>$initial);
      $dbQuery->execute($dbParams);
	   echo "<table border='1' width='400'>
		  <br><tr>
		  <th> Boy Names</th>
		  <th> Girl Names</th>
		  <th> Girl Names</th>
		  </tr></br>";
      while ($dbRow = $dbQuery->fetch(PDO::FETCH_ASSOC)) {
		echo "<tr>";
		echo "<td>";
		echo $dbRow["BoyNames"]."<td>".$dbRow["GirlNames"];
		}
   }