Noo! Hahah I just saw this post now. I really think it's an elaboration of
Ellie, similar to
Annette from
Anne. That would make it have history, rooted from the name
Helen. I hope this makes you feel like it is more valid/less made up; it would for me haha.
It might just be the pronunciation that is making it seem related to
Elliott, but I'm guessing they're not related (similar to
Amelie and
Emily).