the sister is 5’5 with [name_u]Auburn[/name_u] hair short pixie like she loves to draw and sing. she has a crush on the local jock, but she’s under his radar. her eyes are a green, and she has a dimple on her right side. she wears thick purple glasses.
the brother is 6’1 golden blonde, with sea green eyes. dimple on his left side. he loves sports and photography. he loves outdoors and camping. he smells like earth.
Setting? Time? Place? The twins origins? What kind of people were their parents? Aristocrats, hippie? The best way to get help is with one of the lovely formats Renrose has made.
Yep. No good us suggesting [name_m]Jason[/name_m] and [name_f]Savannah[/name_f] and then you telling us that actually they come from Somalia. 
not really sure at this point usually i get names and build up from there. Small town type, but the girl she wants more. Parents are divorced, married to other’s. the girl goes off into the woods a lot alone, no real friends. the brother dates the popular girls.
I’m going to suggest some names with alliteration.
More information would be helpful, but yeah, I like the idea of alliteration. [name_f]Hope[/name_f] it helped 
Girl listed first, then the boy
[name_f]Faye[/name_f] & [name_m]Adler[/name_m]
[name_f]Daphne[/name_f] & [name_m]Sean[/name_m]
[name_u]Jodie[/name_u] & [name_m]Levi[/name_m]
[name_f]Sabrina[/name_f] & [name_u]Rory[/name_u]
Girl:
[name_f]Juliette[/name_f]
[name_f]Clio[/name_f]
[name_f]Cora[/name_f]
[name_u]Wren[/name_u]
[name_f]Charlotte[/name_f]
[name_f]Amelia[/name_f]
[name_f]Josephine[/name_f] ([name_u]Josie[/name_u])
[name_f]Magdalena[/name_f] ([name_f]Maggie[/name_f])
Boy:
[name_m]Levi[/name_m]
[name_m]Asher[/name_m]
[name_m]Coleman[/name_m]
[name_m]Samson[/name_m]/[name_m]Samuel[/name_m]
[name_u]Emerson[/name_u]
[name_u]West[/name_u]
[name_m]Fielding[/name_m]
[name_u]Cade[/name_u]