There’s nothing inherently wrong with these names. I really like [name]Adeline[/name] and don’t see any negative connotations like the one you mentioned, and although [name]Avery[/name] is definitely a boys’ name to me, I do see its appeal as a girls’ name, and I like the sound of [name]Avery[/name] [name]Claire[/name]. [name]Addy[/name] is an adorable nickname! It’s getting pretty popular, but I don’t see anything wrong with it…I much prefer it to [name]Maddy[/name]!
But if you really want to avoid a popular name akin to [name]Jennifer[/name] in the 80s, I would say avoid trendy names…unfortunately, I think [name]Avery[/name] as a girls’ name definitely qualifies as trendy. It’s certainly a “cool” name, but it’s very trendy in that it’s only recently popped up (in huge numbers) as a girls’ name, and it will probably die down soon. I wouldn’t say [name]Adeline[/name] is trendy, since it’s a classic feminine name, but the nickname [name]Addy[/name] is getting up there because of the [name]Addison[/name] trend. I think the reason people seem to either love or hate these two names is because of this trendiness - people who don’t pay attention to naming trends think of names like [name]Avery[/name] and [name]Addison[/name] as fresh, interesting names for girls, but people who are very interested in names tend to be turned off by the rush of popularity.
If you’re currently deciding between these two names, my advice as a name nerd would be [name]Adeline[/name] [name]Kate[/name], or even [name]Adeline[/name] [name]Claire[/name], 100%. But if you don’t mind the trendiness (which I should stress isn’t necessarily a bad thing) then don’t worry about it - [name]Avery[/name] [name]Claire[/name] is a nice name too.