Snowman or Sejuani?!

HI! As you can see in the lower left corner of the image above, after I have stolen the Infernal Drake from the enemy team, in the format of [My name + (Champion's name)], it placed "Snowman" instead of "Sejuani" ("TheGoodGuy70 (Snowman) has slain the Infernal Drake" in chat menu). I don't know why, but it seems to be something (Bug, Easter Egg,...). Can someone answer me please? Thanks!
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