User blog comment:Gsimenas/Volume 8 Yen Press naming/@comment-28251580-20160828101837/@comment-6697950-20160829182257

I did manage to find entries of "Koper" by entering the JP name to google. Though it led me to a town rather than a person's name. Whether it's the intended spelling or not is another question. I personally don't want to go for a third option. Either we go for what the fan translation used or go for Yen Press's naming, but let's avoid making up our own naming without good reason.