Yes, Jan even confirmed it on livestream. The reason for the name will blow your mind though. Jan said Elaina was based on a friend, and if you took a look at the credits of the animation you could see Elaina's voice actor being Elly Monty. I let you decide what the Elly stands for.
come to think you right her mane looks so similar o.o also i saw long time ago a anime where (a total casuality) a anime mother looks like button smash mother i mean same hair style, same colro hair, same eyes etc etc