Thank you for your help with naming our third child due very soon. He’s a brother to [name_f]Adriana[/name_f] [name_u]Juniper[/name_u] and [name_u]Ellington[/name_u] [name_m]Jasper[/name_m].
[name_u]Dexter[/name_u] [name_m]Jonah[/name_m]
[name_m]Jonah[/name_m] [name_m]Coltrane[/name_m]
[name_m]Walden[/name_m] [name_m]Coltrane[/name_m]
Something else?
Thanks so much! 
Of the three, I think [name_m]Jonah[/name_m] [name_m]Coltrane[/name_m] has the best sound and flow. But… I’m not sure [name_m]Jonah[/name_m] is as fabulous as your current kids’ names. [name_u]Dexter[/name_u] [name_m]Coltrane[/name_m]? Go straight to [name_m]Coltrane[/name_m] as a first, nickname [name_m]Cole[/name_m]? If there’s some family significance to [name_m]Jonah[/name_m] that I don’t know about, ignore my comments and stick with that!
[name_u]Love[/name_u] [name_m]Jonah[/name_m]!!
My personal favourite is [name_m]Jonah[/name_m] [name_m]Coltrane[/name_m], due to the lovely flow, however, [name_m]Jonah[/name_m] doesn’t quite seem to match your sibset- Perhaps that isn’t an issue though, for many, it isn’t, and that’s totally fine! Sibsets don’t come up that often in real life; if at all. Have you considered [name_m]Coltrane[/name_m] [name_m]Jonah[/name_m], or do you only like it as a middle name? I personally think this appears nicer when listed with your other children.
By the way, your children [name_f]Adriana[/name_f] and [name_u]Ellington[/name_u] have absolutely stunning names! Mom made a good choice. 
I would choose [name_u]Dexter[/name_u] [name_m]Jonah[/name_m] or [name_u]Dexter[/name_u] [name_m]Coltrane[/name_m]. [name_u]Dexter[/name_u] fits beautifully with the others and it is my favourite in your list with just the right amount of intrigue and uniqueness.
[name_u]Dexter[/name_u] [name_m]Jonah[/name_m] is great!
I agree with the others that [name_m]Jonah[/name_m] feels a bit too “simple” with [name_u]Ellington[/name_u] and [name_f]Adriana[/name_f]. Plus [name_u]Dexter[/name_u] is so handsome!
A combo with [name_m]Coltrane[/name_m] just seems to make so much sense with a brother named [name_u]Ellington[/name_u] 
[name_f]Adriana[/name_f] [name_u]Juniper[/name_u], [name_u]Ellington[/name_u] [name_m]Jasper[/name_m], and [name_u]Dexter[/name_u] [name_m]Jonah[/name_m]
Loving [name_m]Jonah[/name_m] as your middle!
Adr1ana
Ell1ngton
&
[name_m]Isaac[/name_m] J0nah
[name_m]Calloway[/name_m] J0nah
[name_m]Leander[/name_m] J0nah
[name_u]Orion[/name_u] J0nah
[name_m]Rainier[/name_m] J0nah
[name_u]Sterling[/name_u] J0nah
[name_m]Tolliver[/name_m] J0nah
I like [name_m]Jonah[/name_m] as a middle name and love [name_m]Walden[/name_m]. So I suggest [name_m]Walden[/name_m] [name_m]Jonah[/name_m].