But they are still both legit.
It is also funny how nicknames can catch on or not. Like I very much doubt anyone would just call my little sister
Daisy unless her parents had actually initiated it from the time she was born. Same with my niece
Norah-
Norah is a less natural nn from
Eleanor than
Ellie for example. It is generally a conscious decision to call an
Eleanor Norah.
Millie for
Emmeline would have to be the same.