Hmm…
I’m assuming you in live in the USA? As in the UK where I am nickname-names are more commonly used than formal names. I know and have heard of loads of [name]Charlie[/name]'s and [name]Sam[/name]‘s but know only a couple of [name]Charles[/name]’ and [name]Samuel[/name]'s. I think you need to take a ‘British’ view on this and ditch the whole worry of feeling boxed in by your son’s names not being the formal choices. [name]Don[/name]'t dwell on this fact! It’s common you’re in [name]Britain[/name] and every other boy is called [name]Sam[/name] and [name]Charlie[/name] ; )
Your ideas…
[name]Charlie[/name], [name]Sam[/name], and [name]Alex[/name] - it works yet I think [name]Alex[/name] almost feels forced onto the sibling set. I’m more of [name]Alexander[/name] fan compared to just ‘[name]Alex[/name]’ as a stand alone name.
[name]Charlie[/name], [name]Sam[/name], and [name]Nathaniel[/name] - I think [name]Nathaniel[/name] is too long for [name]Charlie[/name] and [name]Sam[/name]. A gorgeous choice. [name]Just[/name] doesn’t work. [name]Nathan[/name] maybe?
[name]Charlie[/name], [name]Sam[/name], and [name]Daniel[/name] - It works yes [name]Daniel[/name] is the formal choice but I think because their all short, simple names; the sibling set works!
Suggestions:
[name]Charlie[/name], [name]Sam[/name], and [name]Archie[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Alfie[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Max[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Leo[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Harry[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Henry[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Ben[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Milo[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Jack[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Liam[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Jake[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Isla[/name] - I think [name]Isla[/name] feels to ‘modern, unique, exotic’ for [name]Charlie[/name] and [name]Sam[/name] which are rather simple choices.
[name]Charlie[/name], [name]Sam[/name], and [name]Iris[/name] - It works [name]Iris[/name] is a cute timely vintage name and works effortlessly with [name]Charlie[/name] and [name]Sam[/name]. Three brilliant vintage choices.
[name]Charlie[/name], [name]Sam[/name], and [name]Elisabeth[/name] - [name]Ellie[/name] works in this sibling set whereas [name]Elisabeth[/name] just feels far to formal.
[name]Charlie[/name], [name]Sam[/name], and [name]Lila[/name] - She works with [name]Charlie[/name] and [name]Sam[/name], [name]Lila[/name] has a lot of spunk and seems to mirror [name]Charlie[/name] and [name]Sam[/name] really fashionably. I think combinations is great.
[name]Charlie[/name], [name]Sam[/name], and [name]Harriet[/name] - I think [name]Harriet[/name] despite her formality works effortlessly in this combination just because [name]Harriet[/name] has this really British upper-crust aura. She seems to go with [name]Charlie[/name] and [name]Sam[/name] because their also popular British baby names. The theme of [name]Britain[/name] runs through this sibling set perfectly. I think [name]Harriet[/name] works so well. I also love [name]Hattie[/name].
Suggestions:
[name]Charlie[/name], [name]Sam[/name], and [name]Millie[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Daisy[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Alice[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Beatrix[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Ella[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Anna[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Evie[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Molly[/name] (not a fan but this name may appeal to you and is super popular in the UK)
[name]Charlie[/name], [name]Sam[/name], and [name]Amelia[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Mia[/name]
[name]Charlie[/name], [name]Sam[/name], and [name]Effie[/name]
[name]Hope[/name] this helped x