Firstly congratulations on your new baby 
[name_f]Anna[/name_f] is a lovely name I’m honestly just mirroring the thoughts of the other berries [name_f]Anna[/name_f] is classy, elegant, universal choice that is so timeless. Brilliant name.
Nevertheless I completely understand about name anxiety/regret as I felt this way when I finalised the name [name_f]Lilia[/name_f] for my daughter. I never envisioned myself with a [name_f]Lilia[/name_f] this name wasn’t even on my radar I always thought I would have a [name_f]Rose[/name_f] but then loads factors came into fruition and I ended up with a [name_f]Lilia[/name_f]. It felt odd having my daughter have a name that wasn’t my name and took a while to get used to it. In the end I made a pros and cons list surrounding her name took some time out from thinking about her name and it really helped me conclude that indeed [name_f]Lilia[/name_f] is the right name for my daughter.
I would suggest taking some time out stop overthinking about her name maybe try and not use [name_f]Anna[/name_f] call the baby ‘baby’ for a while so you can have some breathing space. Hopefully this break will ease the anxiety/anger and any other emotion surrounding [name_f]Anna[/name_f] then revisit the name make a pros and cons list. If after this process the cons are really overwhelming too you I would go back to your OH and revisit the name. Then try and make a new list of names that could work which will hopefully help you find the new right name. However I’m hoping you’ll discover that [name_f]Anna[/name_f] is the right one as she’s beautiful.
Good luck