I like
Autumn a lot. It is my favorite season and gives me a nice image. For some reason I don't like it enough to use. Maybe it's the fact that the only nickname option is Autie or maybe the fact that in some accents it just sounds like ODD-um. It also feels slightly 2000s to me.
I dislike
Eloise but
Autumn Louise would be fine. I'm not fond of
Cassia with
Autumn.
Adele is too associated with the singer and I'm not fond of
Diana.
How about:
Autumn JosephineAutumn IsabelleAutumn CarolineAutumn LouisaAutumn SusannahAutumn ClaraAutumn AdelineAutumn AdrienneAutumn RosaliaAutumn AnnabelAutumn EvangelineAutumn NoraAutumn Selena