Hi there! Looking for some good sibling name pairings for:
Camille / Mila
Camille - French “honorable"
Mila - Russian “Dear one” / Spanish “Miracle”
AND
Gabriel / Gabe
Gabriel - Hebrew “devoted to God,” “a hero of God,” or “God is my strength”
Sibling names we are considering include: Nathaniel / Nate, Eleanor/ Ella, Evelyn / Evy.
TIA 
hello!
[name_u]Gabriel[/name_u] ‘Gabe’ and [name_u]Camille[/name_u] ‘Mila’ are so lovely! you seem to enjoy a somewhat prominent ‘L’ sound in your choices, so I tried to include that with all of my suggestions, as well as a couple of nickname possibilities.
[name_f]Matilda[/name_f] / [name_u]Mattie[/name_u], [name_f]Millie[/name_f], [name_f]Tilda[/name_f], [name_f]Tillie[/name_f]
“battle-mighty”
[name_f]Alice[/name_f] / [name_u]Allie[/name_u], Liss, [name_u]Ace[/name_u]
“noble”
[name_f]Juliet[/name_f] / [name_u]Jules[/name_u], [name_u]Julie[/name_u], [name_f]Etta[/name_f]
“youthful” or “sky father”
[name_u]Florence[/name_u] / [name_f]Flora[/name_f], [name_f]Lori[/name_f], [name_u]Ren[/name_u]
“flourishing” or “prosperous”
[name_u]Louise[/name_u] or [name_f]Louisa[/name_f] / [name_u]Lou[/name_u], [name_f]Lucy[/name_f]
“renowned warrior”
[name_m]Apollo[/name_m] / [name_u]Ollie[/name_u]
(the god of sunlight, prophecy, music, and poetry)
[name_m]Alistair[/name_m] / [name_m]Al[/name_m], [name_u]Ali[/name_u], [name_u]Terry[/name_u]
“defending men”
[name_u]Elliot[/name_u] / [name_u]Eli[/name_u], [name_u]Leo[/name_u]
“Jehovah is God”
[name_m]Raphael[/name_m] / [name_u]Rafa[/name_u], [name_u]Rafe[/name_u]
“God has healed”
[name_m]Dashiell[/name_m] / [name_u]Dash[/name_u], [name_u]Ash[/name_u]
(meaning unknown)
[name_m]Wilbur[/name_m] / [name_u]Will[/name_u], [name_m]Bear[/name_m]
“resolute” or “brilliant”
hope this helps! 
I think your whole shortlist works great as sibling names for [name_u]Camille[/name_u] & [name_u]Gabriel[/name_u].
But for fun, here’s other ideas:
[name_f]Adrienne[/name_f]
[name_f]Andreia[/name_f]
Ann/Anne
[name_f]Caraline[/name_f]
[name_f]Celeste[/name_f]
[name_f]Claire[/name_f]
[name_f]Cosette[/name_f]
[name_f]Delphine[/name_f]
[name_f]Evangelynn[/name_f]
[name_f]Evie[/name_f]
[name_f]Jane[/name_f]
[name_f]Kate[/name_f]
[name_u]Marie[/name_u]
[name_f]Melodie[/name_f]
[name_m]Aaron[/name_m]
[name_u]Andy[/name_u]
[name_u]Asa[/name_u]
[name_m]Athen[/name_m]
[name_u]Douglas[/name_u]
[name_u]Everett[/name_u]
[name_m]Gideon[/name_m]
[name_u]Gus[/name_u]
[name_u]Henry[/name_u]
Isaac/Ike
[name_m]Jeremy[/name_m]
Jonathan/Jonny
[name_u]Joseph[/name_u]
Joshua/Josh
[name_m]Lewis[/name_m]
[name_u]Michael[/name_u]
Nathan/Nate
[name_m]Paul[/name_m]
[name_m]Russell[/name_m]
[name_m]Silas[/name_m]
[name_m]Stewart[/name_m]
[name_u]Theo[/name_u]
[name_m]Warren[/name_m]
[name_u]Wesley[/name_u]
[name_m]Nathaniel[/name_m] and [name_f]Eleanor[/name_f] are great!!
[name_u]Camille[/name_u], [name_u]Gabriel[/name_u] and…
[name_m]Hugo[/name_m]
[name_m]Tobias[/name_m]
[name_m]Vincent[/name_m]
[name_u]Noel[/name_u]
[name_m]Bastian[/name_m]
[name_m]Theodore[/name_m]
[name_u]Henry[/name_u]
[name_m]Oscar[/name_m]
[name_m]Gideon[/name_m]
[name_m]Frederick[/name_m]
[name_f]Delphine[/name_f]
[name_f]Harriet[/name_f]
[name_f]Georgiana[/name_f]
[name_f]Lillian[/name_f]
[name_f]Felicity[/name_f]
[name_u]Florence[/name_u]
[name_f]Juliette[/name_f]
[name_f]Sylvia[/name_f]
[name_f]Beatrice[/name_f]
[name_f]Rebecca[/name_f]
[name_f]Geneva[/name_f]
[name_u]Gabriel[/name_u], [name_u]Camille[/name_u] and….
[name_f]Colette[/name_f]
[name_f]Cecilia[/name_f]
[name_f]Amalia[/name_f]
[name_f]Helena[/name_f]
[name_f]Isabelle[/name_f]
[name_m]Nathaniel[/name_m]
[name_u]Julian[/name_u]