Carly, Carter and....baby #3 is a boy

[name]Collin[/name] or [name]Collier[/name] would be cute.
[name]Carly[/name], [name]Carter[/name], and [name]Collin[/name]
[name]Carly[/name], [name]Carter[/name], and [name]Collier[/name]

Break the C-trend! Or at least use a C with a different sound like CH or S. I like the suggestion of Oscar as it has the C (car even!) in the middle so isn’t totally out on its own set apart from Carly & Carter. Although the only others I can think of with car in the middle are Icarus or Zacarius or Alucard but they don’t match at aaaaall!

Carly, Carter, & Chad Nelson
Carly, Carter, & Chester Nelson
Carly, Carter, & Chet Nelson

Non-c-names:
Carly, Carter & Oscar
Carly, Carter & Owen
Carly, Carter & Mason
Carly, Carter & Landon
Carly, Carter & Ryder
Carly, Carter & Lincoln
Carly, Carter & Dallas
Carly, Carter & Maddox
Carly, Carter & Zander/Xander
Carly, Carter & Ryker

I think my faves are Ryker or Zander as many of the others end on an N which would run too much into your surname Nelson?

My favorite boy names are [name]Brayden[/name], [name]Grayson[/name], [name]Gavin[/name], and [name]Logan[/name]!

I would choose another letter unless your favorite name just happens to start with a ‘C’.
Suggestions:
[name]Brock[/name]
[name]Dalton[/name]
[name]Mitchell[/name]
[name]Landon[/name]
[name]Miller[/name]
[name]Trent[/name] or [name]Trenton[/name]
[name]Jarrett[/name]
[name]Porter[/name]
[name]Tristan[/name]
[name]Wyatt[/name]
[name]Thatcher[/name]

To add one more “C” to the list I have always loved [name]Courtland[/name]. It is a really sting manly name, but cute for a little boy. It is a family name for us and little boys go be “courtie”.

Other names -
[name]Owen[/name] - you made a great pick. I love that name
[name]Arthur[/name] - this name plays off of the hard “ar” sound in the sib-set. It is a bit old fashioned though.
[name]Henry[/name] - 2 syllable to match the sib-set but with an “e” sound at the end that I think compliments the hard “n” at the beginning of [name]Nelson[/name]. [name]Henry[/name] [name]Nelson[/name] just has a nice flow [name]IMO[/name]

I support you in breaking the C chain. I also agree that you can’t have a first name that ends in “son” when your last name ends in “son.” I don’t think any name ending in the letter n flows well with your last name, as it begins with n. I don’t really have any suggestions, but [name]Nelson[/name] is a Scandinavian name, so you might want to check out some of them. Good luck.

[name]How[/name] about names with a ‘c’ in them:

[name]Alec[/name]
[name]Archer[/name]
[name]Beckett[/name]
[name]Lucas[/name]
[name]Oscar[/name]

[name]LOVE[/name], [name]LOVE[/name] these suggestions!