Im not sure if anyone knows the names of them yet, but in the video "Art is the weapon" there is a little photo of them in the bottom right hand corner of the screen. IF you pause it at exactly 0:39 you can see it right under the ray gun :)

The girls names are Cherry and Lily.
Sweetest names ever! xD
Proof from Frank's Twitter: link

I'm guessing Lily is after Frank's grandma Lillian that died, and maybe Cherry is after one of Jamia's family members.

there so sweet n there names are lily n cherry sooo cute

There names are soo nice :)

they're names r so adorable!!!!!