Glennnn (not a typo, it has four n's) is the brother of Daaaale and Marrrrsha, as well as the son of Gaiiiil. He is the king of the Glen and Glen-Dale war hero. This whole story was created during the 2017 Project for Awesome 48 hour livestream, by the Vlogbrothers and many other co-hosts. You can find the full story at http://edwardspoonhands.tumblr.com/search/glennnn+and+daaaale.
I like Glen a lot, and I definitely prefer this spelling. I think it will come back into style eventually, but it's too soon. The most common age of a man named Glen in the U.S. is 53, and the most common age of a man named Glenn in the U.S. is 48. [Data from Wolfram Alpha, for the year 2018.] So I'd give it 20 or 30 years before it is popular for babies again. And I can also imagine it going to the girls (unfortunately).
Glen Murakami is an American animator, animation director, and producer of Japanese descent. He is best known for his work on Batman Beyond, Teen Titans, Ben 10: Alien Force and Ben 10: Ultimate Alien.
I didn't like this name at first, but it's growing on me. I certainly like this more than the other spelling, which makes the "n" seem rather drawn out.