Only known case where a boxer was killed in the ring by his namesake: https://boxrec.com/en/event/115563
One of my favorite fighters oddly enough. I got his career set and even bought his biography. Entertaining fellow to put it mildly.
Although they weren't in the same division, or fought, there was 3 different Ji Hoon Kim's who fought at the same time (all three fought in 2013) Also there was two Daisuke Watanabe's and two Sho Nakazawa's, one of the Watanabe's fought one of the Nakazawa's, not sure if that counts for anything