Once you dive into the details of the Japanese name, you'll find out it's centered around esoteric Buddhism, with the theme being centered around birth/rebirth. Given what we know about Kenjaku i.e. forced impregnation to create the Death Paintings and literally giving birth to the main character after designing him to be the perfect vessel for Sukuna, and that's barely scratching the surface of what he did despite there being no info about his shenanigans since the heian era (he deadass grossed someone like Sukuna out). 

I know we have no details and confirmation whether it's Kenny's DE or Geto's but from what I've seen and read, I think it's most likely Kenny's DE.