I used to watch Paulsoaresjr's "Survive and Thrive" series. In the second series (after the game was released) he started to call skeletons in full gold armour "Skelebling". I don't know why but I remembered this and when I got to pick my username for my account back in 2013 I thought Skelebling sounded cool. I had thought about changing it but decided not to after I started using it on other platforms like Steam and social media. 4 years later and I have never changed my Minecraft account's name, and never intend to.