I was originally just going to use the same rather unique handle I use across various platforms and social media--and then while creating my account, I realized using a name that people could very easily track down my regular social media with was probably not the greatest idea.
So, quickly brainstorming a new name, I was thinking of something involving yōkai, oni, or something Japanese folklore related. That led to me thinking of Yōkai Watch (a video game sort of similar to Pokemon) and the first derivative from that to pop up in my mind was Yōkai Clock. Antique clocks can be kind of creepy in the right setting, and since old objects in Japanese folklore can possess a spirit and become a tsukumogami, which is essentially a yōkai, I thought it was fitting. So, that's what I stuck with.
So, no deep meaning with a rich history behind my name--just the result of an on the spot, stream-of-consciousness.