I wonder if you can answer this question (ちょっと長いですけどね…).
There were three Pokemon created for the second generation games, えんてい, らいこう and すいくん. They were legendary beasts that controlled the power of fire, lightning and water. Obviously, their names come from 炎・雷・水. But I have often wondered what are the roots of the second part of their names. Recently I thought maybe てい＝帝, こう＝皇 (or maybe 侯), but I have no idea about くん. Can you think of anything?