User blog comment:Kogath/Monster Hunter X Discussion/@comment-26261665-20151013195316/@comment-5963861-20151014134215

@Raven: The Hunter's Encyclopedia. [[File:Concept-Eel.jpg|thumb|342px|Enshentosāpento/エンシェントサーペント

Name does kinda instantly say Ancient Serpent so guess thats as close of a name they gave it]]