These have really interesting fantasy vibes to them! I really like the name [name_f]Rosemary[/name_f] (which is obviously a word name, not a “smoosh” name, but has similar vibes) so I’m intrigued by these choices as well.
I think the one I like most on this list is Sagemary.
I think these have a very cool futuristic sci-fi type feel to them - a fantastic choice for a character in such a story. I’m not sure how I’d feel about them on an actual child, though I am of the opinion anything works in the middle (or as nickname for that matter)…
Fernmary would be my favourite of those you’ve listed.