Liz or Lizzy
Some good nicknames for Julia could be Jules, Julie, or Lia.
Cici
Derpfish
Zoey
Clairbear
Some good nicknames for Gabbie could be Gab, Gabs, or Gabbster.
Some good nicknames for Liam could be Lee, L, or even M.
"K".
Barb or barbie
Angie
Sexy Rexy!
Good nicknames for an Umbreon: Midnight, Moon, Starlight, Shadow