If you Google Melaleuca, you will find that everyone calls Melaleuca the tea tree.  That makes it a fact, right?  Just kidding, just because it is online, and used frequently, that doesn't make it a fact. 

But I have found that if more than 10 sources call it that online it is almost always accurate. 

Ask anyone in Australia: A Melaleuca tree is a tea tree, and tea tree is SO much easier to say than Melaleuca! ;-)