Brother for Everett and Theodore

We are expecting our third son and need a name for little brother to [name_u]Everett[/name_u] and [name_m]Theodore[/name_m].

Our short list of names that my husband and I both like are:
[name_m]Augustus[/name_m] (my husband is opposed to [name_m]Augie[/name_m] as a nickname)
[name_m]Oliver[/name_m] (we love this name but the popularity of it scares me away).

An additional list of names that I like that my husband is not on board with (yet):

Also, I am certain that I’d like to use [name_m]Chester[/name_m] (a family name) as the middle name, but my husband hasn’t confirmed he’s into this. Our last name starts with a K and ends with an S.

What would you choose from our list? [name_f]Do[/name_f] you have any additional suggestions? Thanks for your help.

[name_m]Sebastian[/name_m] or [name_m]Lincoln[/name_m] I think would fit very well with your other boys.