Board Thread:General Discussion/@comment-22793593-20131109012620/@comment-5149596-20131121192935

Cole and Lou's last names were never revealed. Nowhere in the show, sets, or supplementary material states what their last names are, just like Kai and Nya.

And before I'm called out on it, "Cole Hence" was NEVER confirmed - it was a rumor that was started with seemingly no basis at all, and people began believing it because it ended up on other wikis.

Oh, and for the less popular "Cole Brookstone," this was never confirmed as well. Some people thought this was his last name because they supposedly saw "Brookstone" in the background inside Lou's house, but what was actually in the background were the words "Royal Black Smiths."