@RedToothBrush, well no. It's not the same name. Similar but not the same. I would know, I named her. And if you called my DD Evie, she would correct you and say it's not her name, and again, she would know as it's her name.
And imo, and others here it would seem, it doesn't have the same vibe. Evie, to me, is a cutsie name that suits a small child but not really beyond that; Eva is a timeless, elegant name that suits all ages. One I love; one I don't. Ava is also very similar but I really dislike it.
There are lots of names that sound very similar but have a different vibe. But a child becomes their name and their name becomes the child's. You see them all as the same name because I'm guessing you don't really like any of them. I had the name Eva picked out since I was about 18 when it wasn't that popular at all, but it's rise in popularity wasn't going to put me off. My DD is definitely not an Evie.
And going back to my original point, the 'sea' of Eve, Evie, Eva, Ava, Evelyn, Aoife just doesn't exist in my area. I know one adult Eve, who is an Evonne, one Eva, who is my 10yo DD, and a 14yo Eva, who lives in a different part of the country. I don't know any others but apparently they're everywhere.