Heya, #7 on the list, "30 Years after transmigration....", The MC in that story, Lee Han, was a toddler s*ave who was tortured and forced to undergo medical experiments and upon the death of his 'owner', he was then forced into becoming an assassin. I think he was called number 8 or something? 

So basically, upon regaining memories of his past life, he named himself, which is why his name is an eastern name of that's so out of tune with the cultural atmosphere of the setting. It's purposefully done lol.