For my first two, I knew almost instantly. They were adopted and I had much longer than nine months to think about it. But I am really struggling with my third, and first biological child. I am interested in everyone else’s timelines!
She was named about 3 weeks after she was born. I wouldn’t say that it was a particularly long or difficult process, though. My partner is just of the opinion (common in his culture) that you should not choose a name too quickly or you might choose the ‘wrong’ one by accident. He would not entertain any name discussions at all until we knew it was a girl and he wouldn’t even cooperate on finalising a shortlist of names to choose from before the birth. I was champing at the bit to talk seriously about names but when the other parent won’t play ball, there’s not much you can do about it. He would say if he liked or disliked something but he would not firmly approve anything (even for a shortlist, as I say) because he felt that he had to meet her first.
So considering that the ‘real’ discussions only started after she was born, I guess it took us about 3 weeks! I had done a lot of prep, though, and we had been able to rule out a lot of options, so it depends when you count it from. Prep discussions started around 20 weeks after we found out we were having a girl 
For this next baby, we are right at the beginning of that prep stage, since we just found out it’s a boy. I think it will be suuuper easy this time, though, because I just think boys’ names are way easier. We have very similar tastes and I foresee a smooth naming road ahead. But I expect the final decision will take place on a similar schedule to give my partner a chance to meet our baby and feel comfortable going ahead with the naming.
We have been lucky too. From first getting a positive result, we talked names and it was just amazing that my DH’s favorite boys name was the name of my very much loved uncle. We toyed with the idea of other names just trying them for fit and sound, but once a boy was confirmed there was just one name. So that was nearly 9 months I guess. Next came [name_f]Miranda[/name_f] which is a love from before pregnancy and when I told DH my reasons and associations he was totally in agreement so that was great. Some years later our little twins, now just one, well our son’s name, I arrived at from nameberry long before the twins were confirmed. I had a totally different girl’s name in mind from nameberry and that was one agonizing journey. From when we were told the 2nd baby was female we started to panic somewhat. I think we settled on the most likely name about 3 weeks out. I was not entirely convinced but it was a safe choice. A name I’ve admired all my life and I really only conceded for safe when DH agree to my ‘unique’ nickname. Now nearly 16 months and that little girl just seems to grow more to her name -not her nickname everyday. I was concerned I might end up wishing we had gone all out for a less used name but either we are very good at just loving the names we choose for our children, or there is a Name God looking over us. Whatever I feel confident now. Time has varied for naming them all and we have contemplated a fifth child-which sounds way too much but i know the 2 or 3 names I have for both genders may end up a child one day or maybe a child with a totally different name. Thank you for inviting us to share these experiences. As I have said it’s that we seemed to have succeeded in terms of what we like, that gives me confidence that we choose names we love or grow to love the names we choose. Now we have to see if our children agree.
Where I live, the common thing is to name a baby a few months after it is born, and that’s when naming discussions usually begin
Then again many people here just give the baby one of their parents’ names, so it doesnt need much thought
My mom and dad had different (and limited) naming styles, my mom liked names that are considered very unusual where I live, such as [name_f]Olivia[/name_f] and [name_f]Salome[/name_f], and my dad only liked An- names such as [name_f]Anna[/name_f] and [name_f]Angelica[/name_f]. His mother’s name was [name_f]Vasiliki[/name_f] and my parents discovered they both liked nn “[name_f]Celia[/name_f]” a few months after I was born, so I ended up being named [name_f]Vasilia[/name_f]